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 0xc76ba915850e82a16897b006b03bb36a08ef2be5ac85c7d25e8334266a84269b. 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/d25f3283-8d1d-4bce-9c78-6daa49eeab71.json and https://artists.proofprofile.net/proofs/artist/d25f3283-8d1d-4bce-9c78-6daa49eeab71.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 0xf8115c2bfdbd68e6a68b03253025023663594282a9835a3c4d566af68920e2ab. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKAZ72327901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186518d3a8ae2804f4282501fd9d53afaacd8272105ec84f38ccbeec75973938. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DKAZ72327910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72dd04be860fbe921734394067745cdef3ecb86e0cf9f2394738b274a8c75909. 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/DKAZ72327903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18c79effc0bc189da0ef98d6a9a9256027cb5be62b985460d3e764057ecd770. 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/DKAZ72327902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0026ee960446ffaf89ae51efc242ecb141ab3887e66c96eece94d340e242226b. 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/DKAZ72267401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59015f7be6d0d7ba74fac7d821277096e051de38eeb277ff2d36918eb8c7f84. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/DKAZ72327909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268db3de5463de7493d540b7d09f65cf6e349ca75d9d5b7e692ef367f0c0b0b8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DKAZ72153402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a62e49b9818a2a4b8b531a445ea3012b2c17e53ffc4ff6e63cbbe6c6a6fbc9. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DKAZ72327906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3feeafbaab746dffcf73c60a2e1323e80cedf5cda6f565986ebf6b2794cda7. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/DKAZ72327908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566c4b5c904f7387e479cb6027ace1ad58ad0f9f68be23fd57e273097ed1037b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DKAZ72327911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf797fc2946b1f1dd1882cd1e9849d16e75490d3940e61bcc89e7f6bb318d5c84. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DKAZ72437907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72dd04be860fbe921734394067745cdef3ecb86e0cf9f2394738b274a8c75909. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DKAZ72327903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc179afc74c2e99b990151aa13a723282f60b645904b8cb6c6c78bb625763d319. 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/DKAZ72327913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646192098648c083d222bc8aac2a1c91354b32ea562709c46ad2f14d542889fb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DKAZ72267402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c7ced554adad30ade8bd832763c1ce88dc78466cd77c508b884fd0c97a5128. 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/DEGE92100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811e4e97503b351fcd56d02fed32b2333b677fb956f8581b489695ac1479f80e. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/DKAZ72153401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d7c5b1d90fe5762b337d781a6b2fcbb383749fbb6dba8cf7e200b800ae6a28. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/DEBL60911737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8115c2bfdbd68e6a68b03253025023663594282a9835a3c4d566af68920e2ab. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DKAZ72327901.