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 0xbf58e1067fd68744c6532f8905519f9aec84c6b011b12d6649729da0ad9c21ca. 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/46a5010e-2cd0-45fe-b474-7fbd91a31cbd.json and https://artists.proofprofile.net/proofs/artist/46a5010e-2cd0-45fe-b474-7fbd91a31cbd.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 0xdd17716b0ecb756b9fa59c847b2ad059fd1ee75672932fb28eff44c845de11c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCADI1727019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb8cc6d4250deb6c27b1fa94c79a5ca18203b4b02b00d57f67dabdc6fd32e10. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCADI1727020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afc265c8a03d39c89ecdc721e27d5cd6a1f136eeebb01d6f4e7c7f57c939157. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADI1727021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1462a40fa08635626cdc106a3eb38b1a1d097521442ffe11fd4a4525797f2995. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QMGR32181913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299d58e12583cfa37aca751292d68e16fdf9cd3efd54033a4696f90a34fc67c9. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:57:32Z), 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/QMGR32246599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c627d245b652c194714467cd1794db4ff0200803f5ec87d86d868edea57c157. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZQAY2279644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cef8748ffd2a0b01fe3cda7c955eeff6bb392c4fe8c1473484ed35f1c609b1. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:49:18Z), 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/QZQAY2394465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94923d069ef4a7056fbc38e8ae41d8cc7a353d5ed6668769c2ffcc7546a6a4da. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZQAY2194500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4431a50fcd174a30102adda799ac2d78351c5c448e6028f500b24ebb887938. 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/QT4AH2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca60da75cc56183c709ec1edd66afbf452310af760ef75897480de8b42595df3. 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/QZLBC2100467.