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 0x57187513ff26b9d29fed4a329a5a45a2f207775fcf701c00f739115b6eec03e4. 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/c1ea0e2b-dd18-4415-a8ed-acc3f329ae67.json and https://artists.proofprofile.net/proofs/artist/c1ea0e2b-dd18-4415-a8ed-acc3f329ae67.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 0xa03cbd6c44b11039da96edc4960504157c5410472d745771269cebbc5e965df9. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/DEOO51400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e41599f651a1778519b1ec9cb0f7f06e5e470317e8dd8894b339ddfdd127fc. 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/BEC291213133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d501a447380e1ed96c6b63f3ab43357d10d50c16bd5303b55a788658ca60b16. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/NLCK41046087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a615300ca0604afc3bee505390583f2e50178f9ce5046b7edb14bdefcbd6170. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/GBBVL1905502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710c194ce999c27df8bca438c52920a5362cb880f9cead1a8ae6aeedb7597de9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/DEQ022005407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a7607da32159c0c238cdc702c86ced402908d857316be4a7e32136ad6395b2. 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/DEQ022005408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b8446c0b830fa2d9c132ef680c4e0c76efb466d95b0e5994552cadc26b7b79. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DEQ022005410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dc577c0fb588c35a64996b6d5f164704ef8632176d7ee9273e15f510f175c1. 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/DEQ022110728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf7ec3431bf92043e7130159f7b6a0ed1cf4e1729e189a9e1af87bf2fce6a47. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEQ022110729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa488ddb15bf4a4160f50ae378e6b63ec09a576fd885e6128a307392f869ad579. 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/DEQ022110730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d735a6b10eb21fd5d056501c32c21dcc59417cd93c87bc7381538c599a73687. 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/DEQ022110731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed791dd48b62455bf8cf43a8def194017fe113a5e4d91348eb15629f57eaa9e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEQ022110732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e06b824f6ddb8b7dda582f586c6d4199996a22c197b1940a12372f48213645. 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/DEQ022110733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c836c7539db8def4e220d4e8330e688e724d35184f55d132ca110f4ba2043c. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEQ022110735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8e6937ce2101b2afb08c7f697efe76b3bc85e14112194a1e3996745d52b9f4. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/GBBVL2206371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bafc76a3dd94a7c96d26513b05717b6379fd9ec89a8f7d4ff955c2867643fd5. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/DEQ022291689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86cf79bf27ec6e90146a7b418944d46911141550183ca91fc7f497200792905. 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/DEQ022291692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d5e260d3d121f40d7741c91c1202d147424c4bc73cac4e84ede7be255c46c1. 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/FR59R2471903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb831d575e956d087640364e639e325969239238658d028ba76c6dc725fbb50e2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA092406080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88b37430d552eb510e820e63a0f97cf17c9464420a8f081ef17bec822eedbce. 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/DGA092406081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f3294a2396921f0ec1b0652c8538cdd5d80ef3ccad8e6e9677e9c912f0abeb. 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/NLCK42417517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3a3ba5d8b1e71ed43a1d3f39380bfd65adba33188c70e073032d46262062bd. 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/DEH742525099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fcdcdfa2bfcfd7150f40c0543acff8082703d19f6e99d537332918f9ad0e50. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLCK42219361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd653bfacb2d36935626767babec888dd5ac06558ba73efffc8b10e791f81b5ec. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/GBKQU2445859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e4b3884497c88457bfcf51de3bd2d474fc3de70a93431222571168a274ee48. 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/NLCK41079655.