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 0xb73327cd7ff1788de87ac13d2e89e70a44a133c52db6ee7f1f63d576ca09374a. 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/3e94cc6d-7635-48fe-b7e6-c8fbf8468791.json and https://artists.proofprofile.net/proofs/artist/3e94cc6d-7635-48fe-b7e6-c8fbf8468791.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 0x9dbeebd4de5e7609ed105305c79076047f12b4740fcfb6a42787726c279b0659. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/TCAIV2406045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dc10b454aedfd63997e5c800d44a8661ba60bedeb5e883f1eb90d4cf5c927a. 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/TCAIV2406047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61f863313ae545e695b2f2d41f00110ea71952159a3b54d46b4f76805d1a683. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAIV2406051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198a6e011d1bf4d0f6a27b49a687265df84682afd336dc4dc13c303778408956. 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/TCAIU2406054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe944bb76e73b62bdb5f48e99861e5037967a64544bb4bee7867872d34f4cef82. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAIU2406060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf599deebe7946932214af0d3888b68f0025803120351bd155b2f979c683e8e21. 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/TCAIU2406064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d20801bb0b80fd1e32a9fb9b574533e7dc3a5c8f0c7c26e6917691c9207aef. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/TCAIU2406078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdd422b98de25bd842870e417af7b2e8170b12a97cf9f984bc53c080027455f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAIU2406186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef18e882aa0d22d570aaebfe8f06e59bfdf95ed78a900e14114de403627983dc. 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/TCAIV2406189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b92720fa5e943c8a17e6f8d60e83fd4338227ded619ddef6ddfb92144276a0. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAIU2406194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82da6054575b0fe448d536f4b65cbee42706740876b50ff1925bd349ae40d8f7. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAIV2406199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99718252800ff2a0d3d9f547eb8403044736af97619d024d4b74ff6caebb911. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAIV2406203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a749ebd516f3ef84d9d26a3b376a1faafc1f398d1822499110e8f03188b17e. 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/TCAIV2406205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe198f6792e69a19651bae771c3073daa1ed76fdd4260e4b6d81a1145babefe17. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAIU2406210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08dc9b9f1b383acb64be3fae8231699c6ec0b94a5440503c388ee5684544afd. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAIV2406212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a024a5737ce48b187883016635be16c9f6852c0e70513a013e646e941d03ad. 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/TCAIV2406213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1bfa46e4815bb4edbad0afa6f72c2ed1e257f02bb7bce0eb8289fdd24b205c. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/TCAIU2406214.