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 0x512e41861dd3226992b4466d4554a9c4b4d4528ca5cc02c2dca1dcf5fbacea02. 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/05c788a7-179d-4ef8-8695-1db803a886dc.json and https://artists.proofprofile.net/proofs/artist/05c788a7-179d-4ef8-8695-1db803a886dc.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 0xe52494aec88c3fd16556553a12750494aef3eea91527b7fbf3bc7a6842e6425d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ7L2414833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec97fdf7e91328fb913543f51d2ae8f7796065ff948bef4fb0639ed0a23dd822. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7L2414836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6122f2ffd4da525f7e2d796af0c80aa480cac72e6334142ad1ba5bf7e2cd55. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7L2414837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525aceaed7e999cc56aaa89d0b536809aee68ad7a18052fb86b3fe48276576bf. 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/QZZ7R2466173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48011c9776f630e80249097c5885a0cb9982a7c2ca569b92902af4875384141. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZZ7R2469372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126eca29b6242bcf6fbb11fa59a317afcde22c5dba9a4c993961a986eeb2eecb. 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/QZZ7R2469397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c361631b98442b2c7843c52f70bd06efa34ea3fffae62de0176eb728aec304. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZZ7R2469401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3700edb48084c6a9d36906e62a259f4a4f6071cc5b3038652554ded0a37039. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZZ7R2469404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ad14441a64bcdf52173c063e3d14c11e1af3c68678c0e07664a742dfb82e53. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ42594780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17465d9d49b60b1202cb3dd810e7fba1ce92643d7e9be36ed8dbec3f86c72c4a. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZFZ42594781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640cb9af8d34bdc75a6f1fda846fdd3da7d2d0b0574533e642eeadf75a1aa2c9. 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/QZFZ42594782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0011c15cc776a714c0287ab3a80363dadec100ec21432d80bb126df4e7a256d8. 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/QZFZ42594783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8dc3654dce3b674c9df5b7f90b40dcec086ba13d3c4cdbf28996e24edbd18c1. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFZ42594784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9d2addfa51c05dcf2beeda694df33e75b3fce57ecfba41b63ba5036bc29e6f. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZFZ42594785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19a3cab5dfd60094fccf794e6b81b6393556e77be31e26b67156e4fd86bd427. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ42594786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5f601866eb8e908f7c3fd81297e4f8130385591f07552abbfe37f7f40bf9ea. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ42594787.