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 0x87ae63194111479d244c565316812f4e9cd62075860f161fe67b634e15e092bd. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c172f4d-9773-4495-8b99-8076098e0f73.json and https://artists.proofprofile.net/proofs/artist/2c172f4d-9773-4495-8b99-8076098e0f73.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 0x70925293e1ebfda4ad750caf5e1e94f1e1f341947faa1ac9cb6e6db57783fcba. 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/BR67Q2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34b8fe613c8a301c31646e365082525993ebc744a60d63cf6913b89848ea46d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BR67Q2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022e99228d10623a14109ad8c02ff1f8f998f4ed0046bdafa19d1db6a9f15ed8. 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/BCAT92500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4478961bd529e225bfa16e58d3ab603132f47227019b74b9240c00186c85c241. 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/BCAT92500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9775d8896aa2896368a0a1f417e694d6363ac302be72c59e639230b12aac4ea9. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/BCAT92500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022e99228d10623a14109ad8c02ff1f8f998f4ed0046bdafa19d1db6a9f15ed8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BCAT92500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18015ea204166c383ffeee34686270ff91464291b100b57bec4ae2963efd32b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BCAT92500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48d599baf47fee16ee5563f273046901e2da00c55bd459f796058f422e4eddf. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/BCAT92500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4478961bd529e225bfa16e58d3ab603132f47227019b74b9240c00186c85c241. 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/BCAT92500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06661de4d70a24d428c012a0ccacd9f62d3383dc77af5744e89e19cf62ef4cb0. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/BCAT92500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3818aa105511aa2317974780efe983f31199ec6058148347d0a3461e070aa978. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/BCAT92500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117ab1813e7fe9f1d54212145f428a75cad88978bdc391ebf5cd1334a4613f52. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BCAT92500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472b9689ff93064dcf57414d4bca52b89adcebf5ac770b11580e079de3790fe0. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/BCAT92500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd9109c53d940fc0ce89d5779e7d647bfc24415f7c7f8f004d14f4104dd4382. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BCAT92500019.