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 0x235c80cdd87d2209ded8c930f9840ee6acfacdcd519a60c623d07870f3b9f16b. 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/100ec0a5-c9b0-4a76-a2fc-708b79d9eca0.json and https://artists.proofprofile.net/proofs/artist/100ec0a5-c9b0-4a76-a2fc-708b79d9eca0.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 0x3a22efb3f796c1a0f1ca5c5bc1b993279178f2f51ab64343c5f509677a7d2e50. 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/QZMZ92021239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349d01f863d0c7cefb56fa523ba350cc7efb04823ca694060959fcb0b66d5b5d. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZMZ92021240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe4719575b2d37e464950a2104427b6aed6f78fb28c34ae89761c5a27bdd96. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZMZ92021241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e38414fbb6b1794b7a0c5b6e8e5e361a4d3833d54b189390629e1f965d6f262. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZMZ92021243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28a11da676957f60fd3cc7a9d962d8ddd356321d6395df2333fd1f4674cf535. 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/QZMZ92021244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53162d9276484370cf0e15dd7664fdaed8f0302bc652c164811f0ad360e8567f. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZMZ92021245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9fbd4496b42b78779a58226fae702dba3aeb94157c052d5bcf0787ca7594d7. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZMZ92021247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391de962176dbdd3e7a17f1403e970d5d43396f9233ba4367d0199debef70c95. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZMZ92021248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a613aca0a3b0b87d3eedfa32af8b47ba2606f4379deeb4ad7f34217ba2837ae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMZ92021249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43452733ac7de90f30f7bc136230b408d7fbd5c9748f3f4c09dbecc1b772c7e. 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/QZMZ92021250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8822ea5eae4f2c1bdb575497e85851af499f5a22820d4f5bd4326a98baa3fc2c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZMZ92021251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d76df0946fdb6592deadad1d7ce615e7122356e06ad20e2e6a73944d88ba63. 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/QZMZ92021252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf025f4f4389b9e1a406cfb6647abb3dac6b6572d577d3b08a2c5f732ef7fae3a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMZ92021253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936db802e3a1a991b602cdfd287353e9e1a2fc3a5a4b46756649c139591c7417. 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/QZMZ92021254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624f376c8864f367b6e9005794314110d569e69346a40201fac724c1b2980688. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMZ92021242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6badda385997b54e95366ac3ba3c23aabf6f3f09b857a49e7f136818dd934e7. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZMZ92021246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc15cfd837c404851d885c7249159a4eb8a5eb6bad86ec4425508f78812ef35. 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/QZMZ92021255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a57e59dd0bdc09fe91e7540700d2a4d2dce6ad96be0ac13104175fc2bc96b7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMZ92021256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87f6ccebfd8dade36bc1dfd77d0902d411d9472a469ec97514df37e351c1d66. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ARF038600170.