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 0xa5d87c30b4edbe87b43e3edd4d5faa80ffbd3f1de77d130c86d9e761b934ab57. 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/ab56a88b-8ddd-4bd3-820b-dc259c9eef38.json and https://artists.proofprofile.net/proofs/artist/ab56a88b-8ddd-4bd3-820b-dc259c9eef38.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 0xc00cee14016f35087aad61c2d8c676072e29fdf8ff235de82f7e785eb3f47bfa. 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/USLZJ1399560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c695b79a3460daf8ab5754acbeb2dd02c13ad23dfcc6db97ebc5361f7864983. 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/UST8K1666238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab80276b0581758c61fee7855f71b639373f35c11b086d5d63216b95f3d59ba. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/UST8K1668396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0859e77f81011cd4e7a05564485430444e6456ec34814464ded70ee88bb90d45. 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/UST8K1668399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f64213557c2443731c2103769fdd96adec4fd6aef094797bdacc60975799f8f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UST8K1672103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b82d0f580cbfdd077a9ba6638036e3585e55937b40db69db28d101f505c3663. 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/QZCE61889486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5607665a08631eb329f328ced5dbf41c5cc4e798cd46b4736cac51077d13825. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:35:59Z), 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/QZDA72099118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cfc76b3cccf4bd8b2e5b5739da791c627bd2c163da6dbe2dea5ba6ddb7fcac. 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/QZK6H2086446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2c8d97cafdf13c9c22b6b4f687ed18af38cb47056942aebecd34c2ec9db663. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:45:11Z), 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/QZFYX2169172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db5915854a544d52986fdb81c3577be943a5dc707e7f7aa5ee4a71bb6577623. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZZEB2423764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7bc22b34be3ade0013ab439a60eb50abf24f347bd4f779b7bf40f57733673d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USLZJ2536244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0dd0c060cae5bb423150f65a8cd82d5ba1232049f09e080d48190491efdcf9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA61862522.