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 0x02245802ea96d29d65ac0767e48022f593dfdf3030cd1587e26386d7047abed9. 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/436e1010-6735-446b-9be4-2f578fcfe177.json and https://artists.proofprofile.net/proofs/artist/436e1010-6735-446b-9be4-2f578fcfe177.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 0x7d7bc90c374a226e8083d82a48ca20a541160027dd3eb0c19a8afb5145be593b. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/GBKPL1942434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160e45ae7a3a0b7396e82978e5d608b814ff18b0122abc4714b9a5cab61ded46. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:39:15Z), 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/GBKPL1949424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f59458097f42fbb4ec3cdc68c6769ac0b51c26baa2c55bcb49e02e09aee2587. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBER72001042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697f78ce456c041b21bf7651eed8b9b6307530c4337d8f3ffbc011524225c1f1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T09:43:42Z), 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/UKXN22031424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837aa6806ebb0996333d485f7a845529129f957b50e02f1ff6b13eccef089511. 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/GX3Q92187158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a2cb4911d292f345eaec9213f8632817bc4e27486f4ade997441a75f63e9f9. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/GX3Q92187159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755e0f767fa03f6a228004ae1a33a83f72b5cf297e20dc8d22e94dec1f56821a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:28:55Z), 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/UKXN22149576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c60fedf83b312d049de6c34e02a71deb407ef61c75bcf385ada097a4124957. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKUDB2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f258e4db01de9d615c66da7e809610b503ad10c96e96d840825f6222e8c5c8b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/GBKPL2098529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0496582b4d73a1491f4c785f723bdc52b161bf3a8374a815d81c6879a0a28f. 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/UKUDB2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944ba80d830ca7ce58917d2266b0705947947ddcd2b50959a236ff9d5d36b29d. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T10:27:01Z), 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/UKUDB2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e54e3b4b6897fe4e9d6088ec8656c83aea894df0d6bd7ab77dc806ee3525172. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKUDB2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944ba80d830ca7ce58917d2266b0705947947ddcd2b50959a236ff9d5d36b29d. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:56:48Z), 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/UKUDB2400003.