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 0x466748a51eb7ac416f84d3663a16daae1a41e53693016c62a2e0ad9acac9b9e9. 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/0cb23be3-1932-4aa8-8f51-1d93c5f81a0e.json and https://artists.proofprofile.net/proofs/artist/0cb23be3-1932-4aa8-8f51-1d93c5f81a0e.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 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 0x83ad63d62bfc223e88c54ed4550d0d86c42fee4d71e21f54470e4a59d5f6df9e. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ESA012275484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c5a3087648aefa533245f9ef4f75e5c922b9e8f50b6bcc9d5441b458ab6195. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRX282206343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1af1008e5c3db67b6109583407cfb6c45a61aa71d04e3966930fdb3bb8c1bb1. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/DGA062284244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d378e227427148c6a5325088f10a854259a2ddbaa5fde03fabcbf655acef69. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWDE2249823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7f530b7a6c10a35c2c8214477edd2bb6c653ba2e9ca228223fb3d640d4afd2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWDE2249838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43c72edcb36f98da091f020e6394db6f9796da6a7ed854fb6c4046b3b3f96e0. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZWDE2249883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725de14442933b285aede594901e8ff3f573635fedf5daff851ef3a2ed94d64f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZWDE2249900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54eccc56b2d7d91f48ea19257c983ff4a0751d5f7a84f04f5e83ea7b6d318bb4. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWDE2249902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f63bfa9d8ea6f6b409180265e77268f8af4ef153fab471474b6398ee3f90ef. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZWDE2249925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d789377969b3f6bd5a7262d85ddc1f83b356a627e4d68797bb04d0a43c783a4. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZWDE2249945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47837ab8c7cebe33ffeab69ba7f1d61f4cdf983eafdead6a05dfeca95194a53a. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZWDE2249956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c880d669f17f9997f0b6e958c7e23dca29db2888b2e19627cd64b5d4c30b95. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZ5FN2304620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54124929fcae5567dffb8e1dc9a9220324c1c77947305122ba1a82af9af6f51f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/FRX452201173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e120a4772d2679b1489d9475c519c5ec7a30149c870f8c01001f623defdc06. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM4TW2497712.
Popurri: La Que No Sabe Querer / Viacrucis de amor / Muchachita De Buruzual / Blanco y Negro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7495877a749b9b8685a57ef5486091f8c376c3536bf0b97a13100aadde6d84. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QM4TX2498156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406cca0e956e22006de5aa472c28e425b8f4a715b544dbbc83d700d9d6d6f333. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QM6MZ2591215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5157d1d80053b7d79a88b9c67be15a08bfcafab812ef7cd4c0ad384163af2d58. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QM6MZ2591207.