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 0xf6554c61920d7d6b0de0a7476ffd11abbe6335e01891f730535ecbd4d6e5b12f. 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/5b94c21c-a440-4d75-ba0e-12eb37d2d0cc.json and https://artists.proofprofile.net/proofs/artist/5b94c21c-a440-4d75-ba0e-12eb37d2d0cc.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 0x4a06ee90781c334142be4836681c2131b3291e7fa805f9ec9e830a4d5c39cd61. 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/SE6TI2141379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb0283c1c3787a1c0893ecf6af4e24a8dad45273d7eb41223d73d8b9d81fc83. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SE6XY2175008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09d461c453c0a6eae8e3dcc66e9dd8b3a67e00462462ff8c1495871b6609b50. 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/SE5BU2214554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3b4ee912a4656d54ded783158aca8353132885c43cbbd4ab8520bb08197495. 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/SE5752296399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3c40ba5819fb9b4551352b079029dfe3b1fee2e09b8fe374da4cffcc0fce82. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:02:26Z), 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/SE6I32218240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82cbafe47f679b6763b5e376c6b451549a16073d08baac21a77d29b892868b59. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SE6QE2242251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cdf148a5dc74460d602627d8d85f54b6c9e737f48a628f138384ed3bc75213f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/SE6SA2234359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738ed4efe06ae39937961110f137a711040d3bfdba6072ee677356a0df714cfc. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SE62M2279201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421ea33be0634c8b631c1f9d0abceafbe3f74882ff35adc120f471dad2098fe1. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/SE5BU2334329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f64e32f5da2c108987c6cf56855050198771ba4364b19cb8099bb524327960c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SE5752358391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cb06f6b25b2802af3d5f028ac6659a8e242dbd218ca1d29e22fd599dc94f73. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:38:00Z), 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/SE6I32332657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c8a4de1446611eb9a76723dfef08e7ee1e4d4dd64aa86e2a4f02fbcd201451. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/SE6TI2345489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6752d11761dcaa30cecb36e245b10bd5832c39a0f38cb59d7a7983919fa4aa3b. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/SE62M2344828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afaccfa9149323223f3882a326f6efbf8f11db5efe37256e43da5ff0f77cadb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE6HN2446758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd71a08866b398999d0273b55b116aa980490d0b60db9052a898eda749c559b. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/SE6QE2485698.