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 0x4b78f2bf2093b2a0496a00909bea5eb7e33c3751be38641c19c7382196fd9b76. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d28db837-e96f-4cf4-b536-1cd63e0bd3bf.json and https://artists.proofprofile.net/proofs/artist/d28db837-e96f-4cf4-b536-1cd63e0bd3bf.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 0x6ea879cc631bf0cdfbbb5d80bd53e3b64227c431b78f9dd742beb474bfa0090e. 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/QT3FC2548459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336911c69d6c9486be4e3a91759d1aa53a377bf645635f4b12b63ead095def0d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3FC2548457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe81e2983415fab6ed7388e4bcb2c757d0b2e811e10b4db012dfffadde7c0d9. 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/QT3FC2548460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fad295464c37f2ad09e3b9ecffdf43d653e0ffa1a8c752f2069ee4b814f39a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT3FG2531889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b2f312d5b863538a44eb770603935debc0582855237fca1a8c77f808b5f40c. 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/QT3FG2531905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6bac59de040d4a329f1afb466cb7c1df0e5c34fefc3772eed088ce0417076a3. 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/QT3FG2531906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8645b7f63e73ece9ddac32df51c6250eeb8f9aac2e3c6f4447ec140222c18c08. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QT3FG2531907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef7af0c8a257ed808db1de6d95f943da425ce488f721cae34bfa5686abe7bdd. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QT3FG2531908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba27bc20c4b3784c1f2a3ccc0694f0b3834659f88901f99f0d8f924e880eeb75. 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/QT3FG2531909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7bf623d781278e3e2510f9d8ec7a80daf9f0b714fb2cf8d044aff59ca28b15. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3FG2531903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc85f84488bad89bff9700c962cee94272794b227702c0dc8ce63a896688756f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT3FG2531904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13bd6c1fe29ebadcd349143ba90959e20f3b9ca279703863e542823f6586611. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FG2531890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d21e228cbe26e99adb103eb2d84f304d23a150d213bec239827c081ada92bb3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3FG2531902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe588c7d3355b08976f232121309f4199cdd0d3e5d0285880d69f169d93ac30f. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FG2529752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61924a3a01e5933009f870e50b639d4288c385039954ab5278e220bf09d787aa. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FG2531891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da2d3a339d9c9114d0702c216c53d08e384c4cad6902a6bf8f5853b364a843d. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FG2531893.