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 0x9310632fe0e662c1d260445b197fe3b2e3e9882a9d72b8f1f9b9aea06793be5d. 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/d294d5e2-e7fe-47e5-9455-855c8d4b5069.json and https://artists.proofprofile.net/proofs/artist/d294d5e2-e7fe-47e5-9455-855c8d4b5069.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 0x4e4a6a12f88c8dcd26543f669a97de8723cf456fd3a591dfc5e0b3606441cabb. 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/TCADL1864804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb784afed23f4bacf9ab073bf0a82026fda5f5b88b31b17c18b7521d82f201d41. 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/TCADI1795866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb162dbb80af2a7a704c8b60437d1d2ff8bee1fea2fbbc58ca608b93fc144181. 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/TCADL1864842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d678f5d1500fd86d77d17702406878733deb52c7d37f437abe503be5b8d85b. 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/TCADL1864808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfc45d9d338c2fc3ca4132832d8d9bf8f629f93b87c47d71c3328386c775d49. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCADI1795886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e2e81871bd7d4df9b3d2d1abecae0c5f2d0d5a2299fdb7a2f54bfbd322ec74. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCADL1864814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1644a997c629906d31dc0fe67aecc75911b296da9898301ffbe4caf179884e3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADL1864817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7543391e58a8357387164b4d1af0716d7b65d3c264f00714b1d2b515d1e0b562. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/TCADL1864819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134de5535654a364c12c793273ebe1f33a8fea35d9c4d0667e60ea11b1acb5c7. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAFX2198574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95f6dbc24f39efabe2a6ad0f9ff8cb6f6da3a0281e393555c63958e92557c8b. 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/TCAFX2198587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e8b4a8ab399a581787d70d7d2a4d54b05c3f0236fb6dede0ad965968fe3691. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAFX2198593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e8e760bcde29be5193deadbcfcab7e698aaa23207d1dbfd774757e9d00b560. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/TCAFX2198600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255a17bf756081f06a11a046c02d62d9bf93e52b303b4b9ec87f754c0b4b253d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAFX2198608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cac2882003fb823feae3cd2b06acc83dfac81cffa2fff242a74955b2b2a051. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QM6P42222350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502daa508c2a8656e92a552cd2c2f330a14f2807be99111a9940d8ec57f13555. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QMDA72287635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c2710fc7f09dd8c2d6f63c046fda91e6b3ee89979c62790c0718da7c19dcb1. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAIX2431857.