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 0xb29da9258fa16e5f0c746bbc879d480a159da1d05bd6b1d5afb20a42372e2ad4. 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/7c75862a-ee5a-4dff-816f-bb5dd38fccf4.json and https://artists.proofprofile.net/proofs/artist/7c75862a-ee5a-4dff-816f-bb5dd38fccf4.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 0x55581dff80ec3a5e905ac5b49154e272620d985f0567be2a19b75a3ea581c312. 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/BXPOB1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170d45b32f888b322cbf025e54f2b9ac9bb92bd017729ed78dfd5eeb4e9c1777. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:04:40Z), 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/BXPOB1900072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa40d0931d79819b960cc4c4936b95b628a8f48aaf08550c8a0dcd978452e67. 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/BVPOB2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa2921405ef50e86c58152767d005fe5b29d86918b8b5cc08216da427ba912b. 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/BXPOB2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0e6c671f02f855dc80ea0f761650cf4e9acdb88e43b8316574fea1b7e51f2a. 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/BXPOB2000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46106e41e272f7781c49c495d919bfdcfd74472d00975e30ebd2a1eaab5811b7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BXPOB2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07197e1085e1cfcd07469b7cae607bf8a41253711cad254b68dee998bb17bd2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/BXPOB2100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1b5f78bb67cd3e4c67da78de3cabd06da879f9f4ac09e2dd6b02c43ab4051e. 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/BXPOB2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f5f8dc12ea5758edc3118b5d652573dee28928a2790407f53905b9e1ebc6ea. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/BXPOB2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e33ee5bbc83a5ab52f7658b048d56631bff63e36dce7da4655236e262c60b7. 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/BXPOB2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a52e3df8b8602a0013738d295f5015ee95ca9572e54b7cc1036bf00dbabc444. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:05:35Z), 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/BXPOB2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c7a3580021ba78b496ca178d2c5f8edbd08340684aa7ba2dcf42f56137ccb1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BXPOB2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ae77529b3d4f7d7fa2c493771795e6d24cb90483382c58991d1e5bc111176f. 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/BXPOB2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d4305495ee96813d55fa33f3a5a40019c94e8903182ca83e7568c29c07ec30. 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/BXPOB2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4479d5ec03b41c6b1a92b465280df54b006a5cd098102ecf5c332757b296dc51. 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/BXPOB2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc837de857e08435634fb18a329391767e7b381a7cdb9228e1f920e2efa62db7. 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/BXPOB2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb482a62b465f7d978fd822d315b61fb5c642d19b8d9ded1c3affe1843a7f29c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJX2083035.