Osvaldo Fresedo (May 5, 1897 - November 18, 1984), nicknamed El pibe de La Paternal ("the kid from La Paternal") was an Argentine songwriter and director of a tango orchestra. He had one of the longe
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4096eda756c72891a2f76e66be05dc5186ab77823c618877d08738ff66238940. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3dbe7b0-361a-478e-87b8-1712b22d68b4.json and https://artists.proofprofile.net/proofs/artist/a3dbe7b0-361a-478e-87b8-1712b22d68b4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e40b69a3837fcfaaec166c70da33a5f4caaef2c2701e9f5b72d4e9f81003a4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31506358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4170aa7da09cf35104551be8ca582f801e8c7af934a9df2ded614563edddd98b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31506362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d996ae0bd1003398322139b7b3df5012b38efa9d089c1a5e794ba04639ba96. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31506363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abe46c0e3a19656ee245a890db82ff7cd2eeee672a32acbb81f15e73f781c33. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31506365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318d12a407b4c6e7180ba49348ff13455a3269ad8725d8179cc34d1cba7f3b69. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31506378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fec43459ade05f491f110337b40c3d1093cfed27e9ac5ef2992e5b50c6b76e1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DETL61624671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad646924d1153f40adcf7202b7edd12420e2e587e94a685ab9fabc6b36f0fc2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DETL61624688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb1aad957b636b961cf135750c844adea1ab72dd52e53cb4b4739d2eb9706a7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DETL61624678.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc514b9d3888a7b6eb0fc3e3922f3d30c86002620a22a98b7ce2e7f0898668e1f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DETL61624693.
Tangos del Ayer y del Hoy - Pasión y Melancolía de Osvaldo Fresedo
El Pibe De La Paternal - Osvaldo Fresedo Early Tangos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8347c9a2d01ab79bd17b6208e049834bb0172154feed353e9ae9986eabc4eb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8351de5cc9a66aed8f57459dcea4b670eb428f1faf7244b9006c1057ccb747c2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c3e3e499fb1047021e5adb0518fe0e1c5363a8df0eb0ac7c28b9194eaef138. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae48ed6e25b50f40d63098a1764f7ea82b15683754d786b0e41f6bf2e18b57f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9002fc57d54bdc28c9a6c0799dd88ae3ab26224cdb05fed7458d5f97a822243. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cac2de2b081e2a05aac1c0902537495cc395948cdfcc98c307efffdf83939bb. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac2326d7efc4a8f1ed27e264d01ac406edd341adaf494a3612c28027322eaa9. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d5ce0c369905d57993730f2435f54f8f1744d06764d41ef3dc2497c93ee01a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEXO32076129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbdeaba36fd1bfd228ba96288c7a64907eb8b096fd6da1bf66a8f8412aa4933. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcaf8d87520652e4452b1546971273df5ad68b52a136ad3a63471c32658befe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c87f10aabb96bc9299c32e9aa23751983dd1eca37097d452e5d299eaeb88ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb2f2328f411cda8adbc8c666f489b68f03dd4ae962833507a5e1cb807eba9a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30b9e19746d36c8c89548afe58be134b772606190f9b4c62f97480e211228d0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eff7434d33327b9a94425f5007aeafd132ff5b14511f5b4f6d58aea308da837. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476107b8d2043e12686c1e40dbd7d346a331cacc999a0c2fc34f7d13755f03d1. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125cc7573714fd36ec7054a062b085f0521cdb9bb924546f6f65b2c87734ab2b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21d5f197b7bd19c3766056d00de3f68f83379f2fe02667e624624182950668c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2498925123854003ab4b5ed1bc3d555372c886dbb0f029f66be468b5358ad7e5. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fe32b13dc9332ee6be46579bf5f243c710621ccbff74b7fcdc83100ba5afa6. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f6f50221e00c54b7c8b6d59330004e34d890294597904186b7eee001424062. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff97e9e9803870def63ce3e3f09f52aa55200d75364b0014ca26e6c8468c705f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbacdc690dcb0190d07de823c8eafed714b293005b0d05ffd2f3ce058b3b90e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704fe29d473203997f55c0a55a5410db44d91eb3cb413e517a21d8d929fadf8c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8dd971e178b0baaefe6ddee2ea5e8521f2fbfd5b47ea517c9e9e208e41790d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9574b938b8e7358d5bae79300be2c00c0f9f797112c57d50417c977cd772992. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedce8ba8b03952186c3ac2f3d3ea732e4dc22a0613dec8ebe153b6785da4ad90. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ce38f4be8efda2867c9eafd77f4b64457c045e8def91ec5c2fc623a44224f3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dbe52458463c3e24e201a381e6a4fcf4b6c9168321959f9d618ee0b02db4ef. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc8ab1944015cba7b709ad7ba192933af99d0ddd441a2a2e35615272e6c54d8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94eb3ed04c34bc2d39a9c20696bae3c926b25eaabf3fedbfba7e5a6c71ac00fc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fe4005e657dfeebca157359b8b4447271ad477179acdf257d822596d8bb05d. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf7d2c5845156d7d55a9fe9fb19a695183f21dbcfe54e499ed61c3ad2204702. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1540253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbcd7b505c3be1b129827d4c48bec6174c78b255374dcc46a906cc5b620dadb. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1540267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6d94d86aabc38286cb7f3359943b2f49c6786abf4aba61ec903081762dddee. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1540268.
Tango Classics 338: Felicia (Historical Recordings)
Tango Classics 337: A la Deriva (Historical Recordings)
Tango Classics 336: Fui Testigo (Historical Recordings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf051abd3bbb07bd90f8e73893643c754f936d07fa38f39c0f6760898193dbdf. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN721405952.
Tango Classics 335: Preparense (Historical Recordings)
Tango Classics 334: En Mis Noches (Historical Recordings)
Alfredo de Angelis vs. Osvaldo Fresedo, Tango