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 0x77de0b35b4ea5d043e326140a134ac923cad8fe3a2ccc97a11434721e2eaba15. 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/6f4bf14c-6b94-48e0-9fa9-54fbf35d03ba.json and https://artists.proofprofile.net/proofs/artist/6f4bf14c-6b94-48e0-9fa9-54fbf35d03ba.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 0x2cbcb99adbe88ceaa9e23586043fc0df3e5e26cf610fcf88d02f784b60645719. 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/BKF442400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffe8a0c5026498576f287821d9471d7213950999e917787c7b20c41d8b0c222. 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/BKF442400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9526194da7e433694c28476e9e2ccb152bab5ca30ed6a4177cc52e759feeb49f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKF442400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e5a5c6a238faad3fbc09434eda7289fa620f04e9dc0e39049994379c798d47. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXX722200052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969fd873f9b42d957221df4d7b4d41e3c64635b74453dff9322306470f67e65f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJX2440890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb0af662027d6a325a7e1f1d2729bb927cccbc303abb0abf12b88c387707f37. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BK2242400656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34740cc2097c9cd44351e58d160c1aec908b4dcf4ef4422a7b66fef4241972. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BK2242400648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae7aadaa84d5e16521120e90057db9216f4bbcef20c397eb48edeedb9b8bae3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BK2242400655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73880d76f4bc5789fd928284e3a5491d686a7b2a85e90f8bf739c5ca6e5b298. 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/BK2242400652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4279aa15728c47e1167bf1dc5b276782d1b3a9b72b86dfafacab90eb0ab8f09a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BK2242400657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb229d2334be2fe496b6ca9d511d6d38513a174c5a4a5cad19f5a5b6fea3a73fc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BK2242400653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457114676818eea1d72ce76d6a2c55a83f8fa7cd432fb442566a7b9d0827adb3. 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/BK2242400654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2985d9e933f2275a6e008c42eaccce3525ea54783ed9c6f7c9dfeca2882c6d8c. 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/BXBXH2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0675aa1fe55ddacf80633cbd50c1f9d8cc2a8ada0f720c884796ae3ef85ea0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BC3PG2401011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c8792d11e9197c23b19d927fe45fe57ac77b42fbbce7e193fa6393386d1c5e. 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/BKHYR2400071.