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 0xbc4edf47c25548377669566c1870b218343454d06d1ffead525086fd735b0bd4. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce05f712-c75d-4df1-90bc-d1de90fe0253.json and https://artists.proofprofile.net/proofs/artist/ce05f712-c75d-4df1-90bc-d1de90fe0253.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 0x040de1c0cb8e02919788d0476ad52fe3c30417d8e811dd331515dbc8db8c5b89. 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/QZZ7U2519478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964df28045ce09b212279ad622f43f17d1ba420ca4fae8d1c4d3e7d016b5d66b. 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/QZZ7U2519480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a8f58ace6049c7f2b2ec8c78dd2ee9ee5db0df58356c416e83a9b3b1210f75. 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/QZZ7U2514206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d76402cd32360e58bfa72b7ab0a9bf79f0d30282205740a7c2b0c6a8985bc0. 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/QZZ7U2514371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26ef226cdb8b6fb0409780127f7c36ccf59b15843b65613a4b2702949615f7e. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7U2540140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893a62e4bc74a7e766994129339ff0be490a7c9b37d2928b23240d13f2891945. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7U2543450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa412ac803bd2fbf1c2f142d61704e4a059f431160a5b8ec89448ddb8a4022fd9. 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/QZZ7U2543444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eab63e1ba10c02fbb69c9c866660755c218a79b3dc1af5b0e7ab3c242226a1e. 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/QZZ7U2543439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8fb1473a43f6d93acb62c63289e4cf2cf7af196bf9ee1b3e1f7ff8fe019b1d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZZ7V2522650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441df77c814718d88f394f0044fe1163a62d1c8c4a8de9071df39a820cb2b813. 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/QZZ7V2522648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3c81a3a9dc77de3b761cca28c5a7363fddc92c3af645e7921bc6af462a5327. 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/QZZ7V2522647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8d7b0a2069d5b8fea763d1bcf3702cf476cd11651e410d30b58278ea5a3a22. 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/QZZ7V2522651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f922ab45fc50cf4e562617bab92c6fc261e26792c7d3ec4cd43642f3475bd8e. 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/QZZ7V2522677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f58ab7a14d0fdde38c72f30e2ea64bf86145c81347d1509eb58957081279692. 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/QZZ7V2539361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063dd78ba13c000636bc28fa7912cb35fdc0118a108cb5001e27a9423c92dfdb. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZZ7V2540718.