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 0xaaa1d7de051f90b98098d36a51b3c57968e0c4012b1545324ca9bcf591616f55. 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/a5ed3697-6491-476d-804a-b44ac628202c.json and https://artists.proofprofile.net/proofs/artist/a5ed3697-6491-476d-804a-b44ac628202c.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 0xdb349f9ef3aa0fea85dc28eee2b4e7fcc9bf0b6ecc791553c72c57ca5810e67c. 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/USETB0811050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3567ea8fb7656c05112a9287e54ce34c51cd94d421d9040062ce5baa90e5fb9. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USETB0811053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c820c4e6a746e328daf4420168375d4d9d9cbab2935f5b74f8dc93747d6fef. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USETB0811055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180eeecc19d302092fc803d00355b941d231602e951994cd279f9e963aa74595. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USETB0811057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb416cb1bf90c7483812d12eeb369dd3155f98ccdc38ec9819e827c2442257b. 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/USETB0811058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c981a90610dace6cf957cf6de045d6fa97879fb3a9c7f5a83b4d4d62ed1ec00. 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/USETB0811028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8271f3fb35535e64c5e2469322579d55c72d7a8a11c0f462e4373995ee764c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USETB0811029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4786fb371df91398e5b71619800b2ffddff23ca9830d7822320cd5725ac26ad5. 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/USETB0811034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9404836b12deadd57a9c926791a99ae649838d20399a72484b90ede3c8d023. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USETB0811165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5677c10d9fa2ac07b7afc7cfc9a0deda67cce793f12b433827c3b0c2f8d87a. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USETB0811122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57e07185f689789d0acda4533188d66494e3491c5160b166e53d79c1039bd99. 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/USETB0811097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b5938ec0cba1981de570da868b13b04b33ad51962edeb7110fc16d236ef93. 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/USETB0811103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a8112a24948adbe869659dbde106da1879fff32715e26ea5e892545037b4fb. 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/USETB0811106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6591613b3aab3369491b1122a0128ecbf2e973d36b29edea5df4bd8101d47c23. 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/USETB0811107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fac0ac3dd7ce704623113d555b75ff70d8c83cbcdfb038b6a1c129510da538. 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/USETB0811108.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2548c33c7c36ac1360d91e8d969f5f59db2ae3df0d080d2c9c01f6e8b8217561. 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/QZTRX2432010.