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 0x3703604b93b15d7e133663924894ed30a33ef459bc2e2bc0f6fbce3864e61786. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63b0d8bb-497e-437a-aca1-bf621dd2e31c.json and https://artists.proofprofile.net/proofs/artist/63b0d8bb-497e-437a-aca1-bf621dd2e31c.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 0x2725a58061892703b6318225eb4f394f8aa3a1e8b9b578eb4e63daa72e6f7c5f. 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/QZFZ42506625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cee902c314eee18f78d6e16a4739eae2aac01dd42a8373b259a53b2189b2e3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFZ42506629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dbf67058e663ab0650eae4771b42ce6eb8c0f8f6002f152aa21d1d87db9b86. 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/QZFZ42518768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099b784e5b78e14731611e13f74b04fb7feb7dcdcc55c57896de387c134b5030. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZFZ42544601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8356021a6d33911d8ee736106e2991156bee7b1b19e4ab805ddfbd4ffc99c01e. 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/QZFZ42589861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8413d159cb91feb55d62de2149b9be306b5ac6f335ad083b33c1975765b9ee. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZFZ42592125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330eed23b63194c7858c9c320b1e56a0444d77cdc6a84a4861828e157e8b5d12. 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/QZFZ62524148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7a4329be4045cffdfedf40bf4d7154daf2d8f5627d6a661606b305cedbac1a. 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/QZFZ62526319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10abb37759b32fbba5941c8eef2609bda5553fbe441b6ad867dad7b75aa293a. 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/QZFZ72509846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x809f8d830a342b4dd6e6792aa50b05a665aba0496ceeee67dd8cb29881dba6f2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ72503616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdc984546bbed92a1dca62a503422119e6516c4ea0a68175ae54a00a29369e9. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZFZ72507676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565b1a5fecd9bad49a6261911a936ebf2819cee0aa366297d2482a87ffa1fd0a. 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/QZFZ72585190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755e78135475451fce1a6a5adb4e255b2664d016ff1109eb0591d377ea213871. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZFZ72586536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d443320244efe46ffbc32e91b51a9f3bd44cc0a1b20d8fe5f36d0e7756ee125. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZFZ72586548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc610a3f30178e193135fbc6f3072e48d36d60fac75389529d1aed6386e46eed4. 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/QZWFH2512129.