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 0x941801242232ac4b25d15fa25a675806850a3afc001e2a1eeac768337cdcd743. 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/ef72d1e3-6c65-4c36-9261-0e2f47c71de8.json and https://artists.proofprofile.net/proofs/artist/ef72d1e3-6c65-4c36-9261-0e2f47c71de8.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 0xde21142a3fea9263fbb90e8566a0d7d0f631545c82342d69498b5b7d826b60e8. 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/AEA141708713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93c36f693b0d660c23939a2a03a314af9c5cced9a611dbc3bba0b1eb71e736e. 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/AEA141902087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b3ce0f832c7145f86f22ca8ed2b34c8ca2f42b3b6cd1d3bd01147956f247c1. 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/AEA142000860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bdd272cfa55404e1c44b8bff42c0735d79b8c0dd6fe033538c23d070d7db7f. 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/AEA142100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da7a6b5e8afb281abce1fcfc11272856c4747482e4fee26d189f85814505d10. 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/AEA142102281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c9fcafeeba77c6dc0823c45bf3cbf7761ebe49f18fc7aa43564f798cc315d0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/AEA142007924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2ee56677817f26e215dc2caa2abc0c41e1055c6049531ab622374852c4cf5f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/AEA142102514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105771ca745ff68d59c5258ca5800ed60c5fae94f240207f8e6faebaf7dafd11. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/AEA142105771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629181c833458725c6859416b5a848247e6101b5c00f49b32ba697645cfd585c. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/AEA142200183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c75fe806bc9b47e0a93ab5ce611a41a3e79408a42b534b01fd08db3e949c21. 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/AEA142200242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7991c40129c4969e671e74a35827830d6eacc4ac12d7ca52a1cfcd987264513. 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/AEA142211373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00fbfa5179ce69747a0e96a82d965e20a4fcc697905d7f5651c03c17b0c96bc. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/AEA142211787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852b6bd01629d57f326ff0e24f7ff7ef7e727d9fb02a2463af36ff112111a0d5. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/AEA142211788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c8cbde229164500c41f7b94bd5ae1e3be2a640e9973061306d22ca352473d3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/AEA142211790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fc50625794da1f80f9139f20f5e1ab44770d78f9f8edcbc9874c68d10b9eba. 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/AEA142300483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ab253e7ae8c692804ce4aea1503eab8a6332b68a49510b82aef1ae5836edd2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AEA142400670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4c776136ea4392260dd9c536db4291d550a3992edb9de9348aec73cb2a6c21. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QM3DF2002642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa285e1f12b3a96787a222da33f031c283d2082eabc5126d4c05010cad8d189a0. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/AEA142403343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316d0d0898a041145b87b2f101143cc485693e61f44f26f6a3f29027158ae453. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USANG2069214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef858e96381ae8709af1832f817a2bf950a0af599cea0e8cc3268799a2da5bc. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/AEA142403342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615ac8e62edf607aa4493e511cfb65ea368902b2a3eaeadb0548e82092e472a0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/AEA142403340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ffeb578525574efc6236a165fa378ebccd3db1329dd761c71d5c330f00bb0c. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/AEA142403339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f1978877cf27322a90878eee2d5d9e46b84f798f1e210dd4e371ace99c61da. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/AEA142502707.