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 0xe8f6d8ecee2cb45878c7d990dfd0c4fa141003d99404d27216c22489593a69a1. 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/b50c2653-34cf-45c7-af72-ca6e9628a1c6.json and https://artists.proofprofile.net/proofs/artist/b50c2653-34cf-45c7-af72-ca6e9628a1c6.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 0x1edfda30644d489c6b1e4844c24625f821c0ebac888ab29d0c972ed0bf14f541. 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/FRX872471896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d93e5e57835dd090322e043d7d8af668c33e0e4247f75f5cc108d058f02c016. 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/FRX872471898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f48bb03680b3e5f05da63a2d60d4c72a75f08f8e0a9430c942485b8cc39154. 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/FR59R2393231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da9d43b567feaf496092419a46079907723391f8a15ad20113beb42cb499601. 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/FRX872471900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dd1f607cc3fc3fa1ff99788b47eb60079f9e32133e20c6cf3d5bb7f8332082. 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/FRX872471901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa65e09762c7bd54eeab7216e7040439baf7e2d501101463f1157fca4ed9294. 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/GXBDS2465561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7775748eb53485d328ace3e7c7c083137f01aea3726243b545eccf61aa789dc5. 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/GX5MX2242200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3985072efb38a9b6f4ab84873a6b5337ad92c6e68b18a8f3c61aae723236e7a8. 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/GX5MX2242201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7587950a0d11569bf203d3cda11e6e5a0d62c3f2ba839fdbbe94116233e5084. 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/GX5MX2242202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45f3fd10774dfa90b8ac53e00ce845f749c8728ab94df4f2a7b424c7719dad8. 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/GX5MX2242204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe48f050fc755fc09dbc73ce8db5c622b0cd985457242263ce988785c1f61bd7. 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/GX4R52311803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93f4827615959747d9395f2a2a6f98f53e8bc871e64fe2ae4ef2b1b446e9adc. 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/GX5MX2153397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5074fb85bec18d5af5e9242622009c34a4f49c2530356bcb86ebf6a2c93b3b62. 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/GX5MX2153399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9506a34855f810bf71fba261e7946f5c137f813546a138da0cae2cfcc58e28ba. 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/GX5MX2153401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11df74719fb0ad19fe51ba6056b668812b8e7aebcd11768f7cdc70ffd9fe4e85. 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/GX5MX2153402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb37a1beaa6b9967057cba735cf883ecfcc7db9a947e735ed4847084fe60ad3c. 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/FRX762124638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76eb7af723662e954b0f31ee423bfba75c8ec9b6fae4fdde41ad2559ea6b1d50. 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/GBSMU9794983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae579822769baa746dc4ebba5892224f551cd3a737f6704338cf6bc65d4d5b22. 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/GBSMU9074162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcdf82ec4721caef8a8e9b00b5efe8114cfeded6742611c3af0765d673f7572. 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/QZK6H2240542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096abe7dcf10ad6ff187dacfa353a93fe7e581d4528a95fa6b17b0211c4394d0. 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/QZK6H2240544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14a2ec998707ab4dc98bfa725a4d625affa7129af42bf9e2ac9a860833e17cf. 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/QZNWQ2185128.