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 0x40eaecb3ad0095352d430644b0f02be6ccff48098a606b82f5d0b8b33880f90b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fa6003f-79be-425e-bb6e-5651ff42f4cc.json and https://artists.proofprofile.net/proofs/artist/8fa6003f-79be-425e-bb6e-5651ff42f4cc.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 0x10ca781cf1befc1dc573e046e7b8918fb6d5b73c491587b0899b6f2c285b330d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWS2490523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198144a99abfbf566ab0ad4bcbae3c27e2c813963ea4d5c8ee14ddbe71b0790f. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZNWS2490526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb04ebfbe678666b519ada339e926d5376da1c30f60a7fc6b33cf326813212c. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZNWS2490527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1278b4e8529f5d11c36600627388685e1aae66838f38fd374c2b610082a4e3a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWS2490528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0957905fdfaf2b73acc30199768388021572ef5543606ef78a9831c6c399e64. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWS2490529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d9830a17f2f7bd26399293be8de7ddc02f72e7203b6b64110797e32f839c8f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWS2490531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6582d5c057f6c53b822a2440ab6b8dd6a5b49ba887730e6d1eb323a3c1834c9c. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWS2490534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b50a21912e062534e85f03d176335f576226adfd4f760f7b35e5c40ad3c8d4. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZNWS2490535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79f59c9a7d5f368b762f5fd455215599d4ab4fa35fc453a2b44438b02712d7f. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNWS2490536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325d2f333d868e76ecc5b61da85a37afd6d467278017c23fbf9a6488765c8146. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZNWS2490537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983b3f5805322f4a058fddd2bf22b52d63be0bc55322c2b34cdb13dafd131cee. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SE5XG2505087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3834a1b87d22f1d22ac87ab91838d300b8593fa754f8daa1abf43a5b7e09a272. 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/SE5XG2505088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf9f9886225d1ac591f4c98f786d0ff89421f876d56dbcd0906ab147b2297ee. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SE5XG2505093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551e9f52f951d886848835a3af8aaf6f06c6846e1d9808d5518b4f6a9dc4adb8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/SE5XG2505094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df3bef41fb6cddd4ac37a9927715694bf9fb4239e388b9a252b4671d12e9a70. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/SE5XG2505095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b2fbec9032bc3657f11c86b027ec06cd40cc9a19c4900e90b6a913c1a13025. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/SE5XG2505096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b878c1f6b2d2dfaf5b6f3b6148a2636cbfdb2f444b81bf744388b30c2cca1f4. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/SE5XG2505097.