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 0xe3fbc20c442f5d31e2fdd5d1f891cb0d6bed2819ed1e46a658d4a6bc286507c9. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e45453d1-7cae-4950-88ca-e2291ba1f51a.json and https://artists.proofprofile.net/proofs/artist/e45453d1-7cae-4950-88ca-e2291ba1f51a.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 0x56bc18399911bccd9a0d3efdb1fa1348c5763a346ae51df39a0a5157973c4e43. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HKC631204788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6178f10df500461a2654d54742eedbd7a2aeb9258d1c09e47a89ccb11e54e91. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/HKC631204789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88105064f8fd1f7d1a593c37139dc4bd753737d5c2157e2570d56d9d5c1c2df1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/HKC631204793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3caa6f50d81a7b06d40cd5cc81f39cdf49729e5d3afe4e9148e71c5fd5d2ba49. 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/HKC631204794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb1f0789d2400d862a0c95649c1cf8ff6e5358735c092da850fe27b802a6f30. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/HKC631305147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f77589144079eb660da4a8fb4cc5f7d96276eb18ef77057cd0a0a06a6b97ff9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/HKC631305150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c83315cc7258dd9ae9df6d78c2e0314c82c0df6a8fab1a1f878a33aded3d40d. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/HKC631305154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd1f839f5d0e47f3384e1b215ed210957606ed8c6a3d0bf085f42b88c65c240. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKC631406067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda168166892b4d9622e01959ec14fbb2d6a1cadb802fdd6c246b4ef49c56004c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/HKC631406070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc749cf33577c412c864f4a7a687fa1bb19ef21d876a88b64e6b7ead2e81cc9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/HKC631406072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38de610379050d8a84d9182d6e984d5ae8fe3b0314436320c4c76f1cd2089ba1. 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/HKC631406073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc630b9772324dc6fe736d42399d7c77bc3eadba15c8d31dc493daa2aead31bd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKC631406074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011b26e2d9113082bd174106ea5499a834a72e011c79a8a2097bfd812c41761d. 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/HKC631707054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407cff9cc97467d8f9511cc908ca446f71dc01c51e83dc5d051c5198441be496. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKC631807466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7928e9647bbfea929a91477d55ef68fa48c03c578a4a8bfe88d4d6e86b6f513a. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/HKC631807468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92a628cf47165296e3734196e63424f5fa049af5f74d113e6acb22a9c58c182. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKC631807467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c6df11417a827c25eb0ab9520c1700e0d151b8481e6e680df501fce53414869. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKC631807472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76555f12d650d97e9610f04f702b1175d42b85097a6419afa9da2e657f76c2f4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKC631807473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ffb629268297040c7a19dfc18aee198609e4b66e73207307794df6dfc8f1211. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HKC631707053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29297401154a2cf1177021d498359325b74855bc5f73341aed2a302e6677bfa1. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKC631807471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc630b9772324dc6fe736d42399d7c77bc3eadba15c8d31dc493daa2aead31bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKC631406074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdc4d98e2c573af877b02f28fe2e1abaab9c3f5a4d5bf5f3bf42afee3d0e28f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKC631204792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f86a4928a39bbffa47dc851a22782bd8ea6efab8b3a7d08496707b5c0623b0f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKC631204790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68edce874344f9ce24884af7b62c86f2b83507630ea0bea557d205c00562f61. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/HKC631907585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29a109dd9f7b61d7585b3dcff8a404b3ba7f4bb6a5265a032a57b1af36722e2. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/HKC632508312.