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 0xbd7fe3224114eed4dfc13baec4a1665fc0633606b857c6c97d550aed634f2a14. 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/58b90c91-9bd5-4190-ad0f-07e26d8f8727.json and https://artists.proofprofile.net/proofs/artist/58b90c91-9bd5-4190-ad0f-07e26d8f8727.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 0x3aa5828012af78279f4dc19dbbef18bdb42062d01dc6951894a7a96c8fa307bd. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US3DF1316350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8dee2648f63d2037d258e720d675c296b20429848d66017253667907ac4609. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/US3DF1316354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec92b63c926a62ead6443fefd20604dcdb120f12a6bace8c27a525b91eea06b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US3DF1316358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940065cd271c4c4979f882495c46125291b375a97f98824b55fa1c128f551c41. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US3DF1316370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94739ef389331fd9c470701dd789b078089ebb24a618f175c378e6855b567329. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/US3DF1316371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05691df06fb4804e951af69bb6e0f15b7591cdef2a50e0914b30655e8c3ebba6. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/US3DF1316373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a465c92abb93d0f9eb20f9b1eb589ddb5637703e55e5beac33616a99cf9d54. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/US3DF1316374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8757507f23751be7a47540342a9dca18c32e50d690ab4e9c5058f58874f69117. 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/US3DF1316377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d9a58c46c8454d7b9be64a5bca0c6f4a7447708d86a5951629ccbae2829289. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF1316326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135ec7b5b9558f8876a20a688dd42c169814de3e4edf004d59e0d705c85097d7. 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/US3DF1316327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed89cdf17ebfed0b5ac7bccbb0b69580be6c8886cc872444ffa159e889e8c4e6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US3DF1316329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8464bde272fe8bf13f544dcc2d3a77b68f9eb66efcdd6c072a6220ada084151. 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/US3DF1316335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc068784f92dc9317d8a7908f2d89c43f74fc77f0b4b89101b5fcb3a523baa8b2. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/US3DF1316314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b3098c63b359916f0796b2bfcc59f9e6dfaad89331534041ebc91d29d15668. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/US3DF1316320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3b8fd30d7fc8f5bf554890c64cd74295c3b5cc1b8b06cb3bba70bc00e28fb2. 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/US3DF1316321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede46f14e6992ce66b7a90784b2c5291068e4d40b56e8cc6b5a5bf26ee7ddcc0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/US3DF1316325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdedde547ccbdfd0a5d5d0820ee90c09e5be9c1573eda84fc667aeb42c880751. 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/QZNJX2048564.