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 0x1417c7599cfb93801d19112936f7e4adbb58119f6ec272b4bd5019c358459a6f. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6476d8f-72b8-4fda-b4b9-d740a55ef9e4.json and https://artists.proofprofile.net/proofs/artist/d6476d8f-72b8-4fda-b4b9-d740a55ef9e4.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 0x7c83624514641cff1f66499e6b694b9a0ed6714dfaad173df1926659dfb1dcdb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKWX82100353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d67710f4d3d711401c5e789f72a77c1b2efcc73d55a9fb8a74eb5eaf706dbe5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKWX82100362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a34c1abdf29a301ca278a90b152b41dd423bf26a6af032864d4796a32c649c3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKWX82100320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ee2f07a973856846a73014c8e7564267d0c0e344be5b50b91e2b70e4c7fff2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKWX82100427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc6c3f2f929435c4eb161d2f45af34a04896c7d2c291f17f3305b5ad6cc6248. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/UKWX82100428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd03d82342d31a1eae452172b45ee57e414c81259b0a7dbb1770027244bc3b8d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKWX82100397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6cf2124eb5ed862fe9e34baa6d993cf0c202cf27712eac0b7faddcc4f1d58b. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/UKWX82100429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40159cf416d35ac19f0965c15158e175cd8e6351d5743a310cf5d3b193842ede. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QM7282460987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1c077b90f0d9ffa5f9464c1644b0aa8b97d39dff276b925c0e8a81ffa8ffd2. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/GBMJG2330242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297ca4a93ca5a86bf86f561570ba367b51d6f7a88f8beb7e6ede47dbd9d902c5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBMJG2327451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297ca4a93ca5a86bf86f561570ba367b51d6f7a88f8beb7e6ede47dbd9d902c5. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBMJG2327451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c59ff39d97e068cc44420a91f6d78d13f18f76ad58909ce2a1efc420784b929. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX452399457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff75ba8da181a26da92edf6d473d3c6cc245f20ac801310fd38771db9e898c2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX202332509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada392ad065d0980d8d80e443605af1a007da1bff182db1e3dd0b003c2dbf7e5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FRX202252173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631c7577b50f31ef0c54bcb523a9db9b687812db753c0dcfd5ca4aeee6e844c3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FR96X1857986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6ba2e8a74e615639589ea42acc23a880221911939625d09f6a372cb30709ba. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR96X1814916.