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 0x51baee5bc0c584eb111dbb3af9b913123638acebb27c2860211b7086dd768070. 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/da1fe1e7-c346-4512-9a18-ee62faad7cd2.json and https://artists.proofprofile.net/proofs/artist/da1fe1e7-c346-4512-9a18-ee62faad7cd2.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 0x589c708185a3c36152a246c1628e34e6bec7977a40cf360c2a0fa9b54c9d1f3d. 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/QZTAT2487821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e7219484993419b5adfe1b58487f32078cf8c37e26ecc2be7ba554c103749c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTAT2487825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e3c01ff7d3dc0ba265076fdeeab118d1aac17e8b29c877b36df7a774390048. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTAT2487826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d15fa8834265fb6d057706015d7976ec50c20c743e34466ca5f285ef61f7e9. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZTAT2487827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173e1326e2f246b3dfdb36258bc700ab6ecc2c9728bba0681a4d6d6063a3bbff. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZTAT2487828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fc8f939e4da18caeae448d78858e71cfe1a69e1731f98dd5acce2d854a72f2. 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/QZTAT2487829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070216511533e687724dc525a7e2644313ccbbc4b0b2c5a5eda0816827af3121. 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/QZTAT2487832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d70e11ac9aac502699ad4cbfeaaa10bf74497d29585125c3db5a0fa819f495. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTAT2487833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255c9a44914d16d13d689cac83b0b3fcca69ea2bd2b385b66146c0ea6e5cb76d. 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/QZTAT2487834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac81eb3670bc932656e6db43661d0bfdce35dfed1ce693d009083f5b82d8eaa. 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/QZTAT2487835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149938acb86c3b7380d46503f08b9bf8c67c88115d1003f3e096899b77e2e037. 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/QZTAT2487836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8392efe7b860369a6c2251e5b2f80e6b265f35fb6f238fb7acb2b1bba514a83. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZTAT2487837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee28d8ed95f39e9cca2ad3e1d30afab39edc61550ae87eb7197114278a8ea582. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZTAT2487838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f6c4b0fecadf211a3982e52d19003b7ba34ceb53e217bfb748fe3e32d82ba8. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZTAT2487839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66dbc5613cfd1792e0fdb5d81ee95ff0b34734cc6752ebffcab51e1eed4a652. 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/QZTAT2487840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397bf31b098b837b653d72acfd6ad93532f640e6bf2de1f4f810946e342e0e3a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAT2487841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb1908cd212f065a0f207abc73ef26a8ce87363118491801341dbfeb1f7e668. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAT2487842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5981fe02a232d299bb0a83ffc783280d5d5ab5c74a38d400f5e16baa24c48eef. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTAT2487843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5502f8fcd35c2e286df4286813b579e71a85cf1ad9320113daa980634139630b. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTAT2487844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217c5a22d1b80e1e908587107fa757b0b608e6e022fc200203e19aa5d9f65597. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZTAT2487845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191b511f943a63819d65ab2bcf953d64200ce2482502ce73cce6ab6489a709ec. 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/QZTAT2487846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4fd35b4ed0501dcbe747593405b2e80038c049ca24ff293db41c5d8d5c12fc. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZTAT2487847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bff7bce1ce106f913c0a4b00b021792b299cc404a9812b50f06207169775e7a. 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/QZTAT2487848.