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 0x57c49614db930fc2fefcade72fefa6e013597c3bb3c590c49fe34a452fe37164. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3606e65-b660-41b5-a880-b495b2325a0d.json and https://artists.proofprofile.net/proofs/artist/a3606e65-b660-41b5-a880-b495b2325a0d.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 0x23dbf4f1c0308d42bc387a68f1c2a7720d918faf5a500fc0e6e19fe4869085ac. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTBC2439578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe866b1199daba335917e643c9ca4a0344032c11b47d82b0d67be31f41961eed8. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZES82463236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5afc6aac7f3420afb4b991a9ae88e3fe3bff94a62d96bc97f58959373db7f12e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZES82463237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1b0a2b516c4ca3a61504c5f5b0d7817760303e19faf8c466209492d4848622. 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/QZES82463238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c8d0a3ae16389e73b39deda0ec02b463336c5593d3546b444d301687e68d6c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES82463239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57ba8a35b75f763c89c62ea5142b6d388f3bb42f880470ee709003277e0d710. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZES82463240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b8466e27831da6b98e19d205a1b1dea5fd318235121f28d495e998ea0379e2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES82463241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192feac1b2bd19d80d9acfd40247de86fe07a3650c5c24cab35c3d64624e2888. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZWFL2396918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52852ebfd6d90fab5b53589ca2eb1acf8e9e157d28acfe5ba706a4f49fe5a9a3. 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/QZTAT2315744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48d52fd0a89b637fa2f88cc4027b86a1db54a50c101baad765928296e67870a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZMEM2352126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678736a17d271bfb760e241272a3429fb3c2c9f73c25de6d7dcf52a748fcc812. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB92492189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d97515af1940723a7bc4b5fea4d6381f31989e543284f8bae528ff799daebc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZMEN2366277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b84abaad2f415438778dd96711bfeb252e5e0124a382044d7e36fec24eff4d. 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/QZK6L2373384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032f09c687d407ed5fbd7620e11f016a0916439a325e111b2e86f54a4c1bef34. 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/QZHNA2314064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d758ef5604ac788b9ba8eec4e763404e1fec499fc03545e9706052bfbb09bd. 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/QZTB62219613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff23ebff50a7af273c28f7593dcc4255c3762d21eb5f9d8672f56b7e50653764. 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/QZTB72268866.