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 0x5abf266700da7fb2dbbd82b79eb541f5fe93326bdfae537a0fa1732a1b7af35b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7f961dd-25c8-4649-bd6f-0c2d4e807577.json and https://artists.proofprofile.net/proofs/artist/c7f961dd-25c8-4649-bd6f-0c2d4e807577.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 0x3e7f0d847fbeff0f6969211b90f33b89cfc7c18ebc5d7c7d2bfda75f99a2d74f. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NLL151301781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf097a72ff59560001989ee1e493e898c14e959eb03a53e3ae7c97db4aca17a6f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/NLL151301782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf297476bc199d132087f8631fee174e0de0f253bc610c21615669ac3e9a37c86. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/NLL151301783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe192fb257977209148f878edf86289562749b817c288859bc55d0431e848434f. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/NLL151301784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f0fc37fd3eae0017868ae84ad657501112dd8b2c4bda0ca50f28f88ccad013. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/NLL151301785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228ddd2731fab38aa0b796b770247b6cc7f4ded76fd9f3721c94b6a3b8edb992. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/NLL151301786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0148de946ac66246e45d7df9f3c0f9eb61a80894a89236459b5ac39c03fc260. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/NLL151301787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e4a007adfcaf588a964f6c544e7b3185eb2dd17353896e6e53ef09f63b0baa. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/NLL151301788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b506d6787d0b670dd5ca9bda851dffbe2cd42dbceaacbd4c1ac6c062f153f43. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLL151301789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce39cf65d82a25617158a614d65e6d4a8661c6d1dcb6a1db23766f088fe47ea2. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NLL151301790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a9a3c0b28c3185362b46a3ca3fa5dfb9e545de7da3a042da9099ad56edf4fb. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/NLL151301791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22b330d179a46f23b2ed9db8ea866012ccae707512c7a5f0e17fc7be09a36fc. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/NLL151301792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a58fb7d14a22fb13834218422c8383c94d11abf0f81dd1cf078d4de4234dc6a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/NLL151301793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7f266408b0b95966e49d6fea70c74f53835493a221671e43a19f0d90623497. 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/NLL151301794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9e67897895f8ea25cd4c16d70859852149ffe5dac4b49e8dc6d8c93f21d4f2. 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/NLL151301795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff872eca872a255d7b1d61734d3c03372ece54b06c7146224721d88d56bf3593. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLL151301796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3105914a2c3c147db2f6687b95cd484fd810f8b792ac251fc80d05b414ff5a0. 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/NLL151301797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837ea40b095c41ae3b849e594351e983b7163f72c1119c7851666deb79acfcdc. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/NLL151301798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b71ae6b1554de02a1dddbe5b656b8a89af84fded1d4ccc93f764cf50e4b924b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NLL151301799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cfaca2277be7aa62c356ceba291da39f63035838d257a2c3ee4948ae2f8592. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NLL150400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ba36f03b447b9ae8dead0b1ff8f2bad43b0183af92eb46abe29ae0b167b1d3. 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/NLL150400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d7288d0aeb830380f4c2da0e2aa72e89ccbf57714bc7ccb5d751a9ebc416bb. 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/NLL150400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c26460f4fb5c7e341e564616f61158f0c2326bf316d342f0e59f4025ef6a89a. 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/NLL150400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52307455cd24f13498872f4dfb808166cb12067d874ef13db1eaafb43710106. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NLL150400025.