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 0xc57dfd69530ea1cc2ca0637b80fab21fd884b51ede8023e96969ab002d31908d. 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/a5597a21-a26e-4bf4-aac4-2b3d211ce80d.json and https://artists.proofprofile.net/proofs/artist/a5597a21-a26e-4bf4-aac4-2b3d211ce80d.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 0x0a3c148aa2720a5e64c57d4678e2ea5db2d1a6de4e61e5a7d72066a95b09daea. 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/QZMEP2224730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685aeb2c15e6852f6cc67c091ab30422a0874458d4b561a6f6e1e5a786a94ab5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEP2224731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8e084794bab668da6fd3c645f4691807d5204e896dddb5f9e1232640427386. 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/QZMEP2224732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94c6f485fa0d9e263516e5afa9c679965495c91511764128e27bc7b9d169b07. 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/QZMEP2224733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaef5431c739bc5589178bb01465d038e8b8c52dbd5507810017f1de92adaee. 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/QZMEP2224734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe408bd826bbd7cfc9ece09af09f12f4c8d013430154758dbc17d0ab730705e. 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/QZMEP2224735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9756a491109c80c3ce0fcfdb36a0d8c94671d271fbf8a9f31cb2ad46d113021. 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/QZMEP2224736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe1f77c6fc5dee280e141162ff739f8b58c4d631b094db851ba1bba4840ff0d. 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/QZMEP2224737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d65420e11e9c48d1cc6676899c2f60cb0772c6efd934112bd399c15daca3467. 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/QZMEP2224738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84c4e5674d42d80529ccd1b3458475075c425aa2158c6ef7be7c72cb7848e3f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEP2224739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42401584bdffbcfa405c2c74dff7ce290b0ef93aff78d6fe9ce1f536f5c77ab6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEP2224740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3757dee43f2662e702a3c2b1fb065e34042fdb18b05a824264d0ec44b148a6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEP2224741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3637afe1a449f2945fa5f68a3909442ffca753f9d0da28eece276acfb09d3d99. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEP2224742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c6a03f88dd876e4ef1d26028017925f12181e7323d765ee474035e7b7b6cca. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/FR59R1911020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039f45d48cbd8beec75aa31f3b97e1b52f898af15e8d7a8d41ea4da8d25e1b41. 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/FR59R1911021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c95e6fba187e420b4d98096f8889d76e1c3e39a3e347070d21df8f67c9bafda. 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/FR59R1911022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72283f8234b4001f108b03c687b3a2ac759d99ca0dc298086931acb2db0b60f. 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/FR59R1911023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932327d650fa31c20cefcf9f6bf1f11386018649c5a3bedd9f2f7b0464f19683. 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/FR59R1911024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24809a2c2b2ef04945cde8da137dd814ee9bb4c12299e693551ce738df64c2b8. 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/FR59R1911025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f877b6054c8157778e03ee103c452577910e99afd7034dd37af1326200180a9. 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/FR59R1911026.