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 0x873bad020500a8bd9644da2c7918c4905ba25aa9d46bd6ccdbc0a68767e4c897. 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/98875ada-eaab-45e8-b0c0-129cf2ece818.json and https://artists.proofprofile.net/proofs/artist/98875ada-eaab-45e8-b0c0-129cf2ece818.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 0xb88a3177e1b3bb2480d4331ca20dd2655b03737bef614e02be0643c39eacdf03. 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/DEY472273812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52769afb25debd180cce6d9c8979a9c27b6927388fb798d8f910cfe34b4d7f70. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T16:02:50Z), 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/DEY472273809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ee27f8d14638d7657b3bfe9b1a0886bc3d379fad506c0f63b47f006db73921. 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/GBKQU2348564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde0adcbbddba893d2fcd02689e7914ac7e2572c5dc015c23d1300fc07ddc609. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBKQU2348565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad97df5a6c692c570613e0affd191a577786f6359a40fb3e829b702c616520a. 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/GBKQU2398857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2b51e04acc209c48b11f982fa2ef4585ecdbd2dfe4773b691f945cee281e50. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/GBKQU2435461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff9df741b853c9dd44c7355e39e109459ef37f6ba1261769e6fbb706020d6f2. 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/GBKQU2488702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20ee3b64114c9ec52df23cc6df9dc2248813bc17e4f82e9c10015837e93e703. 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/GBKQU2488703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaca0ad954d99c1dcb24aa60baae0d5370f8148301a9a9d84c42b693fef7251c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T12:17:59Z), 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/GBKQU2488704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097477db3b5b15105691fe80b86a12e20574de5a1399de82a42f91b0d0b0708a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBKQU2488700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33feb1dad814bd5fab1aca2dad7adf2ce40310fcc724832d73a74f96df578447. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:45:24Z), 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/GB6LY1601644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed690bed77c1bf4e7dea1dcb5e0ce0c2d5b4e1acae97ebdbbc7d333c66630ca. 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/GB6LY1601645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043c68a7561024d92fcd484a9f730cc2af7e0ba4ef660df54304cf0dec5e2f91. 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/GB6LY1601646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a4376e749e5186b23edb856d86df2aef34cf37329a23069ebc824679333365. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL8RL2533231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf451b85997f9e4e19c0ec2089534481eac7d85dfbb28e4403912518de574107d. 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/DEY472176512.