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 0x343059252841f19babb705f457eea6262d482a2ecbc99463d85ee75b7f0e8bc1. Chain 2 (Bitcoin): anchored in block 953875 (2026-06-16T02:12:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08dfc8f1-8fb3-426d-9b0f-4bfa6ee80a97.json and https://artists.proofprofile.net/proofs/artist/08dfc8f1-8fb3-426d-9b0f-4bfa6ee80a97.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 0x7623c5df4f9ab759248b31e97f75b6d5417c68eebc5a7f6a050b8065d028ae07. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FRZ041901890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d5625a8a14242d5340790cfed0cc5287357b6fc4d0a01fac5a39064616786c. 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/FRZ041901961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ac514e8f4cd1afe252be6e3d28ca4c96d102a607d7c6b1053ebbc2daf2b2d4. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/FRZ041801300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a70bf8a4e7899d7dd6e39b0d5f36bee739d5c3d9578e490ebc5a778b8981dcd. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FRZ041801302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b2e00ab710c69e92d8f08f9479c9c3ed4bf9e2e4d941293019f5b5d82c6ee0. 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/FRZ041801299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404ea4cdd61724f7df704d737bc9e5bd552771688e3c310f7a8b37252959d587. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FR9W12416216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f4b2609ba7ba36db9095a63f9e4a6d22d4e1e5a6e87867b1d96eed845511c1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR2X42158869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7623c5df4f9ab759248b31e97f75b6d5417c68eebc5a7f6a050b8065d028ae07. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FRZ041901890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fabbe01390ddb19cd95bea8629ab646867b3a9d4fb2e3a5e24c80a4872380bc. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FRZ041800857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12a7a6fd02eef41a2099989604ef5a595c66dd4000f587bd2a5d0f38f39ba89. 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/FRZ041700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7480288d99c98b68f286d49cce8cc7406018af772d6bb977db66efe5f0358470. 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/FRZ041700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b238027a44cb4c80d75b84e980a7dd5bc993b2de2bea521320ba7008f655897. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ041700003.