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 0x468aa7cdf41988042af5d7dce611afe30430639630cdeb59ba3eb9d3a168d1e5. 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/9c193bbb-8893-4828-8e0f-00f61ec06ec1.json and https://artists.proofprofile.net/proofs/artist/9c193bbb-8893-4828-8e0f-00f61ec06ec1.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 0x72fc63996d2bf2064ac4710e3b554eff4c7370299187960a61f8d5fcb4d3f7db. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/US4R31338500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678b7ad1720dd8ce8b5a62b0888ad26fe543cb95914e0f47ac7bc1b1d38574d3. 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/ITE011508522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2080944fdf2d9ff056cdcdbfd646d7f5c257d0a0863864db3c8303e689c60c03. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ITE011508524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601feeb6b2f7f091be285995ad24ee894b399fa156b1febdd000ebea9c156a37. 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/ITE011508525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492632349e14d74ceb3f95a25051e9177e50ebfe866cdaad30f1955035fcf355. 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/ITE011508527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f70194273231adac43eead62e2644d354a4bb92cccab4568c99d392c9baf8f. 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/ITE011508528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8467d688ba9be145988ab23fb668ed0f06bcc511e90a44e15535bc4051897682. 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/ITE011508529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3395cacb0baf45696a6a62ca2c01dbf4c1f0ea1c85439efedb695cb75b9bc520. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/ITE011508530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4dad90dc7803251e66049da074dc4a1895dcd6139e38d2c34221b5cd7235e6. 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/ITE011508531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff26af67461a5d2e6d27b4466ca2c5844f95676ff7f5b7f67c9630dc32606d0. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ITE011508532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4f6d3f02e06fba653349241bab6067005509b9e9b9988c3c0b8470ddf85f67. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ITE011508533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d92da229461e9024c14959508dff1a8f5d3caa08426f04aefa4c06a308d1ab. 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/ITE011508534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d1523ef244b34b107a9151f71ab029f2254bffce7dc9ed45131eec9abfa814. 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/ITE011508536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b8864f35d5589164bdb20a74e9968c36487c7152790fa38b5715fd7388c60e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ITE011508541.