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 0x6bdc438d3588c54b91839b7975646756e6a34ac531e1e75b5eb48298795d9f10. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d986023c-317a-4a78-b3e7-6e0eeaa09acd.json and https://artists.proofprofile.net/proofs/artist/d986023c-317a-4a78-b3e7-6e0eeaa09acd.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 0x2bd7e0611a12bc80515e7a0a9c67a7808a70a7e28a6b5b3b0e0d0167574ca0b7. 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/NLL8M2000541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd7e0611a12bc80515e7a0a9c67a7808a70a7e28a6b5b3b0e0d0167574ca0b7. 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/NLL8M2000541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ed9a08fc83d66c086fa0bdd047693cdcf2f992ec2d26e776a37878d9f4d4fb. 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/NL1LU2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d08aa4e4850b8e5c5b75fba6a6545b2d423349402d57c05d4bade1fb49695e. 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/NL1LU2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98afc6189acb3ddf132befd433a32650f658afcfa8d20e561de19c10472b906e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NL1LU2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aae84e15e1f0af9793fcffcde72a41c0c44c6e3cb411d7465c7e1e83c116950. 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/NL1LU2100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ee61e27c3d6a01293701a9c2c37bdbda2dd799e1c87e4397606638b40c5580. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/NL1LU2100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bca357ad4d4f7a857940767d53b7947a8c33ab999c21725118a4a59b40d408c. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/NL1LU2100064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf31795bd29228199c6b42e54358b2cb3add90e904faecb0fcead27bbf755c8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NL1LU2100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca2685d867f7ac943b6c3e121e075a99ed3ce6e960f389418f713653d93bb23. 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/NL1LU2200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363c81ff9662037dca46c3ba677eede1887a32c5b6124c01425b381f144a2f7d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NL1LU2200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6561df15d10a764479666bba571d7e8ab84555d857734901b87938064bf602. 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/NL1LU2300062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8150f1c3fec9197b7a8c39af0fcb61e1609d621d96d5d24736343bfcea1ac7f. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/NL1LU2300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d547d2e9eaede90e0926cc215e60009406cf3670d7c9dbf5f2250cdd1009bd. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/NL1LU2300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e70cd661f6ca488bdc9441e5105da181ae3f45db9ebfbdb5d789f8097933a88. 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/QZRP52404122.