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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 0x722fa07d5428724c9c77dbd3f42e0e6ec46cde23a94a48030143fac98d735340. 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/00698e47-2984-4dc9-a7cd-19d01cba34ee.json and https://artists.proofprofile.net/proofs/artist/00698e47-2984-4dc9-a7cd-19d01cba34ee.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 0xd7e2d11e0b1050d10f6a687eb7fd35db4183e4c7e8abaf9ff861c33e3678a2fe. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USA2P1689828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0479b1a86a52f0b2aedbf5b3de0a5759121e868614465844d209f3e2d72dd0f8. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/US23A1501150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a056bc97e57902ce787dd64341366a35cd444e8ceee7cebc68936cc8e42db03. 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/US23A1501151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ede19f4b0c6c1d9ae5617787eeed6939fd415546af8b4b3ca00291535fb53be. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/US23A1501182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf7a27209ba8db905c908abd8b649103039e45a8025802a95b3d562e8355c76. 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/GBKPL2176813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf7a27209ba8db905c908abd8b649103039e45a8025802a95b3d562e8355c76. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBKPL2176813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0404209748476f7dbe7b9d599d4cf4254b1dca67bf5ab42bf8127c4aeb90c7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBKPL2176817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe611fd5d0908bfd94f61f3e1fcfd6d1487417ea4077712d452739d1d624644c8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM4TX2386264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba88af6b41759d09872ac85c6945734e3cc5568e50787dbdf03b6d7ae2ad485. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QM4TX2386266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332a86d99cb8d119481270d6b963de5acf4037a8df994a69b4591f1ea04904b4. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZYFZ2388866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389951dad51251fa76c1404d87648f75079b39cc5cc951ce0f1eb22373f1a823. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QM4TW2475497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5370529b95ae47936f68c312826f14d9e8e28c7056c7b2022ed7739d0cfeb882. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QM4TX2407167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870620f522ba922138f830b6c373aecc6239714735523628db9bbca2839b2bd2. 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/QM4TX2407206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb41b4feadae4c8ffa9a65422e313f0e44ad36a5787b172d67f5e24f810f50e9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM24S2204199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb41b4feadae4c8ffa9a65422e313f0e44ad36a5787b172d67f5e24f810f50e9. 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/QM24S2204199.