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 0xc58e59b5ffde65ca78c01fbd8d0ec5d57475872fa20897f00994b29b39da263e. 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/aee4c413-5f08-4d7a-a0ec-3dc2fa2986e1.json and https://artists.proofprofile.net/proofs/artist/aee4c413-5f08-4d7a-a0ec-3dc2fa2986e1.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 0x15be651723411f5fcd8826c698f4e3738918383120d5cb550e164fc7ed61e7ee. 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/QZK6M2289925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfaf3762bb4fd114e0878c3efc93538d54fc8932f8d05c3d1bbb1b875f18e7fc. 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/QZK6M2289926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174497694a5cb2057fd4d400c3331e3638f34bcd09f0742e5b9ab9b98f677caa. 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/QZK6M2289927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fcf410271759898749903c30f66b682f6a1c5707e4e228e39d765d7ffbbd36. 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/QZMER2250247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936a675d158c6040072c7eccbbccd6622bbee0109614a6ca88a2d18638d68807. 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/QMDA62328019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fadb02b8dd0e8a04e8c67e71f9dd4cad9fc4ebf3b2d87e69cca2bc7314a896d. 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/QMFMG2328680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772352138b2fa7f23a0f3952ea953094156956926081185901290b2f65ea0a75. 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/QM4TW2478923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbf0a2f5ce1e6a914ad6f6f8fba27444836dcad831aad783266cd77b2611d87. 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/QM4TW2478926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936a675d158c6040072c7eccbbccd6622bbee0109614a6ca88a2d18638d68807. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QMDA62328019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf87b624b8f2ba94ccff04fcf4f430c5b80c972236ad716c818e2942bdb1b59a. 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/QM4TW2478925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e5e779244cf4618eddd38ad7bfa66dc2a888b0c9b7665088efcbbcd5121fec. 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/QMBZ92459655.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdd55de0481fa70ad6c8bca04d9d8a1df356d49fa4c990a725013d5dbd350e9. 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/QM6N22546000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdf7ec80005d1066666a54c710440fcb4ca45e44fe86934da7be24dba11e59f. 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/QM6MZ2502190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdd55de0481fa70ad6c8bca04d9d8a1df356d49fa4c990a725013d5dbd350e9. 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/QM6N22546000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98732b7cb53b31c4be4954e79085f204fa64c7d597da1d120d283c63dd71ac6. 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/QM6N22546005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c0e0c93abe67b3210a65395590d48ed54b846eb5630f93f289ba4da457aa94. 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/QM6N22546023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e057a62b2868f298c247cd8abcc034fa9ce11f651c808d0ee391006e74b5fb4. 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/QM6N22546054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4598ca0e088c006ccd18e6dca10565317092fb6fa67e72086c6306193505c6. 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/QM6N22229476.