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 0xe249f5048d734ad1d22016f29204747f5079f81fee62771c6b94b62b00eec615. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). 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
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 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/GRHR10972307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42aefd67480668bd1c3585dcd9d3acd570171a6c66c926abe579058033dbae3. 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/GRHR10972309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5ad0de984ab4764c79af67a1066cd218bf707bfb12be7ac0979e332742ba59. 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/GRHR10972310.
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.
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 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 0x25679c907e766947f7b927639935baf06286e5538493ea78db841225250f6500. 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/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 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 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 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 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 0x633eb954c5f982af6ce6b47a6a245f335a59e57338c482876694385d0602daef. 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/GRHR10971613.
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 0xe4e41db4b264591b98fd58016b757aefadbd485b7383b9c16dbdca4c91a62763. 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/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.
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.
The best of Argentine Tango Vol. 4 / 78 rpm recordings 1928-1958
The History of Tango / Anibal Troilo / Recordings 1957 -1958