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 0xccc5cc1c8446c5b84676e033562520c4386059b188a288d8c71d7f1dbf0ef456. 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/0f81380f-7508-4ff5-a33b-aa2119355d08.json and https://artists.proofprofile.net/proofs/artist/0f81380f-7508-4ff5-a33b-aa2119355d08.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 0x41b42ae5a92d9c0176ca5390719b38ec2ad5617e06ec2e290d4bc5230646b997. 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/CBEYJ2443640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa641858f6346e9fe2d281533e1ade6e8949e8cf5ce3084f4d74bff0769dbbaff. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/CBEYJ2443247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490631785864d562b9ac90a0a614c7a64a2fab60a2b2a5bf6d301c7cc832e69e. 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/CBEYJ2443245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2651b3124dac1340db4121d79968a68365bbc7ffd0d8eef27c0abcdf08343c. 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/CBEYJ2443246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881b4d39c267797cda8fe28c96b796126a747c620a13dfe1d6f1b28cf8604f52. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CBEYJ2443644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275cec88de49b5b84e40f8c1486608ec895e71cd06fd7048830280445f7d9bb2. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CBEYJ2443685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346c08e3c2f204b7a42041b77fdca551379bd8273481e690ee24d9e704811d32. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/CBEYJ2443682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b76495bc703b48e03eb944fbc39326305100a35641127514a6ef1f12124340e. 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/CBEYJ2443667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c40c266bb8cb5145b3a195885d66234c7aa6bc0373bab7ff5b5173f44d390a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CBEYJ2443664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3638924dbbaa16c80c2c47767e012d7425669d55e43977ba5bd0dab73af32e0c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CBEYJ2443669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ee6374c64cfa6a855ce0dd47a9acfecb0d08dff7a0f080b15a67aa76c421df. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/CBEYJ2443668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89c3ea61adc7b1b93c2d9b9a2fae97cb01e48d0eec7b7e184a0e04dfe808bdb. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CBEYJ2493031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b44932b8ecd9f30a0f1375c3b3dbf5cd51854b1bd5bfade5c105b61a5ea11a3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CBEYJ2493041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc50e01e7aff49a90a5f34d5ecb9aa6b9084973c5e4acee845cf59b9c362d6f5. 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/CBEYJ2493049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346567d404cbcd0810ae8a91f4244785e0adb214c1cd9419591fd07a8cefea7c. 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/CBEYJ2493027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750131fb7516672ec51eb00fe92a64132bf8067cdb744cc1d139b7ff48ffa1c7. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/CBEYJ2493042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3b108acaee315175819108bfe98b8f2276b2fe3c4eddb8ee81a1948cefdb4b. 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/CBEYJ2493033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a219230dd0902c8c0ab00127ff8f12b040a80441445c57e73c02f03bf3534c. 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/CBEYJ2492776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb8c02dacd6a85f7edc67c052511b5cfb051398d03efb9e9bda8c9d87acd138. 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/CBEYJ2492777.