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 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 0xe249f5048d734ad1d22016f29204747f5079f81fee62771c6b94b62b00eec615. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/172029c6-c612-4fbc-b117-541837713372.json and https://artists.proofprofile.net/proofs/artist/172029c6-c612-4fbc-b117-541837713372.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Valses & Milongas / Recordings 1941 - 1944
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 0xeb7a23cad385ea88f140a7d204f7400d6d9af328f316331f9d984da65d805195. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GRHR10972301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5d3be40e409a5fefaf235599a9f187f754c6aa98c5769fd3d829c12956a5c7. 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/GRHR10972305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1edcd89b6a1f83aed25e6d5095e3fd7fcb3e6dfe1117d40750518b328745e4a. 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/GRHR10972307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42aefd67480668bd1c3585dcd9d3acd570171a6c66c926abe579058033dbae3. 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/GRHR10972309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ad0de984ab4764c79af67a1066cd218bf707bfb12be7ac0979e332742ba59. 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/GRHR10972310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600ad9f4231f46fd3657c13dc8e755dc0aa78382b4c342a59910394fba39a019. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GRHR10972311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191cdde88f2959f01509f34ce9e178f6671f631e3483b422a815dd587b18ace5. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GRHR10972312.
The history of Tango / Tangos & Milongas, Recordings 1947
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0944100ae13f44c8eb240c1c103dadc57a4ba2c0c50bad2d1a756c319b20782. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/GRHR10971906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25679c907e766947f7b927639935baf06286e5538493ea78db841225250f6500. 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/GRHR10971908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557263a153abe59f11658e0e18c9942a1bc62b15bb0e6b511f0ddd5e23cf3536. 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/GRHR10971910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff8a5494f12a9d86770bf4b9dedb688e04a7a65a94f42b1dcf83f4127842151. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GRHR10971920.
The Immortal Pichuco, Vol. 2 / Recordings 1949 - 1958
The History of Tango / Anibal Troilo - Francisco Fiorentino, Recordings 1939 - 1944
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1d2614410282df7988ae2af074a9f7568ad264e995ebd67cbf35ace03f8271. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GRHR10971601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7abd6fe3d967e8694a3e823aa011b5eee9cf5204761f8bbb9b37a82297fe21. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GRHR10971602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b3de1174c3b55657b622188dd0d686bc1f122fe897c8442a0993368486463b. 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/GRHR10971603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ce033af4469566e66e5111c70a43274e30502540f2c94c6fd15733cd5052ad. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/GRHR10971604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bb357b54f59f8600e348727b79db30c6d3f2d1fc04853f7ec670bfeb5ace45. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GRHR10971605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce47d4e1e755ea5aac575fb385e61c6c48511852c9a32ef42a046d28ef6f75c. 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/GRHR10971606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e3aa49814269fe12a72211e402c4bc2e1edcfbeb5966ebaab30831c86a5644. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GRHR10971608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6ffbed31e8986e35d03cdca8e2127b023590391496e6573213b1d1ad0b1bac. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GRHR10971609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d15cebe9f44f3dcb7efa04576e5289cfcea4474d2888b3cc9866523340409e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GRHR10971610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2edffbe9a5f7f04063fd637ceac7f812706438e992a22256582923dd2811777b. 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/GRHR10971611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b07916686bc3ae6da0b10ebac7a35e6fec377516fb0ac7a7abc6a57aa05ab04. 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/GRHR10971612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633eb954c5f982af6ce6b47a6a245f335a59e57338c482876694385d0602daef. 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/GRHR10971613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c0ec1afb7606545a69e49e3d2db4306364ddb90e16ee809027a37a914eb7c3. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GRHR10971616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9739713d51f17bfb40ba8cd139736ff2d2116fed0d3047d928cf1d4fd4b63fa2. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/GRHR10971617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ae19b6aeabe7dda2c838b8966b066e68d0c0a4a11a401f70ddb7fe7112e87f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GRHR10971619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d43d1ec0286860b5bd1b449946a344cfb55c97932d231e254d4637f0bf8520. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GRHR10971620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d4502ac095625e2f3e43e2096c6a71db92d7945cf8bdb55adbbe90f000481d. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/GRHR10971621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d84a625cde30abde0e451478bc6701529fae089670b1d0b2b16e546aa78a9ed. 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/GRHR10971622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44edf42d7f2719198a3b5d4abda409ab27944eba65a0395e3e9fdd62238a713. 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/GRHR10971623.
Anibal Troilo & Floreal Ruiz, Recordings 1944 - 1949
The best of Argentine Tango Vol. 2 / 78 rpm recordings 1927 - 1957
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5e2cc5d50fbbeeb916b9c8efaa78e6c8b09ffb1d07ae78cb61b24437da0eb8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GRHR10638703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e41db4b264591b98fd58016b757aefadbd485b7383b9c16dbdca4c91a62763. 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/GRHR10638706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451b1f427645a15de212d8c15fb954b0690afafd6a23cd505be69523ec980666. 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/GRHR10638708.
La muchacha del circo (The girl of the Circus) [1928]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706c6abcc284fdd8656545ef8717cfb66536276bfb98b91cac454a7a48a6f7d3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GRHR10638710.
Esta noche me emborracho (This Night I ‘ll Get drunk) [1950]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c2119e9bd7f4a100fc1eb06eec261579948f2d3a9929c36593fc09302e92bb. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GRHR10638712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c84118e2f21501c68d7aa066624018a238f9522ebde54dfd4c5c6682d0cfcd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GRHR10638720.
The best of Argentine Tango Vol. 1 / 78 rpm recordings 1925 - 1955
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee041dd1faeb6144faab5b382a1d6e4e679fa2fd9fbe1fb9805db296f4be03a4. 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/GRHR10638611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a370d108519b8c6af4e2b4b8326cc640cdef80322f91c2bf43be7a5fe5117b. 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/GRHR10638613.
The best of Argentine Tango Vol. 4 / 78 rpm recordings 1928-1958
The History of Tango / Anibal Troilo / Recordings 1957 -1958