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 0x9ec5bcede14c1ba4caf579b2b7e0273681b74bef152a0b5b9111c00ee457d9a2. 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/cea6337d-19e4-4fef-a1c9-271593272e13.json and https://artists.proofprofile.net/proofs/artist/cea6337d-19e4-4fef-a1c9-271593272e13.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 0xc36f585df8ff0eb9a319bb39787b68a0e986b84e060443b300bcf7404c8a0429. 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/BXCND2100452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36f585df8ff0eb9a319bb39787b68a0e986b84e060443b300bcf7404c8a0429. 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/BXCND2100452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d1ccb4ee721bd899d826c5076317ebb62d66402bcc2517066f097c28fb35d8. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BXCND2100478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05c99a62ac16171e601a4d651b7fc38d57183b9918a0d066c777b06aa4b93f1. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/BXCND2100611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05c99a62ac16171e601a4d651b7fc38d57183b9918a0d066c777b06aa4b93f1. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/BXCND2100611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556079448c043f50366aacd5b78ec104757ea792d99ea00d694f8675cef9fffa. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:47:15Z), 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/BXCND2102601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8adf5fa76f64f1d59d20d6d310796a2ae5ae88ede9fc4810fd623c757b84b5b. 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/BXBMP2300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd1fc7f18eef9f5b7eef43d344562a2d3eaeaa6425eada3d0e270bea9d4232f. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:57:58Z), 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/BXCND2402122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd1fc7f18eef9f5b7eef43d344562a2d3eaeaa6425eada3d0e270bea9d4232f. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:57:42Z), 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/BXCND2402122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b18f11cbbdbdf3f8511339e8ff929136fd42e55fddb7816c40be889754ff5b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/BXCND2402127.