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 0xd8f8326748c6cfd8182b1a296741ed06fbeffc09c67e4d10f316fdc89b0d42d4. 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/8e3953da-0e4e-4924-b47d-5e7327513778.json and https://artists.proofprofile.net/proofs/artist/8e3953da-0e4e-4924-b47d-5e7327513778.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 0x90c3a0b74e938240811c57236c113cb31ecd1da88506526fbf8b1535ad570c2c. 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/IL5071700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc713b20517923cc82cc5f9d5b92ea99cb3a7cbd65aa921682448d5dd51cfdc9. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:25:01Z), 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/IL5071700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a76d41bb02de41a889fa064f33a96f6ad95294bb6c3e7368315797b76f9a02. 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/IL5071700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d5f5cf1eabf90ff6c6f4b7909ed10c64b0b3e3feced45b63c724e517329dd3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ72166824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37075948f06fd128d9f6c268cda31e2b2f53defb3889827e07f5e55307acc93f. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T15:51:58Z), 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/QZFZ72166829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc6d8209b227a35ce852e3a628706cb47305ee529913d98ed5e009ed8938c9b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:09:57Z), 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/IL5071700046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f78a5e4eb586488b68753f1e587c2c3f5df5f69570c7ee75c632cb2e7e66a6d. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/IL5071700038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745922f15bb31cf507cde3082dea7dc7daa424d2e55fa2456c8587b2cb71d0ff. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IL5071700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc64c32843ff6987fba63c8294620aae3be61a0582aa67c4b2a7296b74e90ae2. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/IL5071700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed22b188ac78196ef1ad0dababf785d062de06a601905d5f18da129721f4b6c. 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/IL5071700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdbd32663fc23b2b0f9a3ea56a3000917119494d81100f21d6ff31a8d128ef7. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:06:27Z), 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/QZHNA2222912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada53a821dd1e94e4d2b30bf1ddb36c370788d5c1c8034eda4c50ee9012dd89b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/IL5071700050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6976abde7615f6f8ea28fd6954abb8a18916d5233b9a9257d6a166484eba23. 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/QZHN52211416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438d3b6093eb9ba8b245f11291dc821573b3f4bbf75acb2ac606d344025ed895. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/SE5BU2510363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd014220d1771ac73bea7dfbb97df4ebb9a240c51d24b26ed71b088861eef474d. 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/IL1042005518.