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 0x9285c98e31ef08b5ab120444a75cf8cdfe82259c9577688acde47b5c8097a8f6. 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/779d406e-9ef5-44e7-aa76-ca948946f7cb.json and https://artists.proofprofile.net/proofs/artist/779d406e-9ef5-44e7-aa76-ca948946f7cb.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 0x652f3005da42994c3350c8c16afbccaa65a2896132c6cc3ffd306ea41dfc46c0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/DEAX12004020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c2eb77ef7dc396a20e6e2696cd1ad30b9d7db47d09b5936557dd902385e2f6. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DEAX12004019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc73eec999e77b097072ff75f9e8b582417bea2e5f61a0fb60434e1c3177885e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEAX12000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9e45d716a1729c682c540acfc2bd7f757bddf812b9a95b37d91d1df4b27528. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/DEAX12004053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda003f550db561194240df837d4ae30e4064b10695ded785987eba381cad9b5c. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/DEAX12004054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b33e44e5785eb6ec48bdcb15938b631722ae444b314a184672a910f03b8760b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEAX12004055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b65b04c6a4dc12f756ec59574b3ce2ddd2095aebb0e5ec576aa63a8907dd8e. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/DEYT72004014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a29a5840e513152adf7c0f43514fa9ecb4c959a87e46800a1483b7b3d28058d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEYT72004022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095f98cec36f4b3fab4fc4786bc8997a4d08c60cfdb3493cf0e66cc815d0fcac. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEYT72004060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63aec13b22171c63239ce38389c517114df621c313bd68a48111f6e7b5486589. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/DEYT72104099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaded9fb9ecffa8ecf61154efa35e20319b43709e9e47c5bedd91241a06a7647. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEYT72104116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5b737e4052500ed687d6cad3a75d7148a7f5844109384fb196bb08bf703b7e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DEYT72104118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b647f948031cf1893bf800918b8a4c7ff9849b7a13f877b6d9df6a68e5d71ea. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/DEYT72204014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104f97d619be19f3f577e72cc8755d97b6e759fcc8dec6d875b18cb808fdca40. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DEYT72204015.