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 0x41341003fa636e1ae8ed551ca4d6ad283f4c9557106871b1dc55265debda038e. 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/06dd1246-f94e-4b04-aa42-4a916a73b61c.json and https://artists.proofprofile.net/proofs/artist/06dd1246-f94e-4b04-aa42-4a916a73b61c.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 0x3637cb2542a45c129dd03166c20365833a94999ab46455bb10e442549b5443fa. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NLRD52354646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309c20363e2110a41f52529bbff0a68f7dd9f4fc7ab65294fcb66c702c7a15a7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLRD52354644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef60e05b1bd40238bc8d6766c0201e0f43b6b265393da0f91162f4988c631445. 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/NLRD52321121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b40cad5ccdd3cae49c5f52f830fe4721e4c76d30ac276fdb665cd443395320. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLRD52119113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d32218cbe38d19738e4a592b96939b552c33ded271dea8a2a872d7bd9258c7. 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/NLRD52119112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a27aa8c990113495996f933005de9060a7b7b0de72910a57ce045ffa2b8747. 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/NLRD52119059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa093d76c280e4ff4f966953c26a7a9931a26b552877de6e4a475b8ab3eec79f2. 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/NLRD52119043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db0fc81a41e4b99db616154abc6c290aaa9bf39f96f85de517c17c7c7f26ca3. 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/NLRD52119311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe46983ee8ec811db503fb5e0a4cfae89730f639c5843eaa9447f1831d3ca8c7. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/CBF8B2419100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5387239d4311c1327f7f22d026014813ca4971f587291ac099a00f711013dd18. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKXN22587946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18ecabb708ef141c62a7e3285f23e67d915ffdf51df00d63a1bb522cc4e1ca8. 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/CBEYJ2476534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa037b66068e2048492a44e0eccce95cefa77dbcb6b39ce3c6131981c71c55d29. 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/NL3M12409068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712052b29c1cc135edf15e3851b70f11c7ab21b7350ca2a55d2012c365bac8c7. 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/NL3M12409011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6931af30034e8d906713784ff9da69fc4eed8e9645f236e5fdabf866f59a4340. 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/CBEYJ2430594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7c4ba103703b60acf9150f3a2a40074b7b36c686a8fde39e61f4d68c17d1a5. 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/CALVP2420858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a06b6d89a2207aa80e1472f19a0515afe7df55253d89f4981a6c1050abe5d2c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/CALVP2419770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7734f0e32a41c44053a54938c36d8db06f503e9d40b66b2c184da60988c466. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CALVP2477044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8244af12363746d8f73f1431f49c16714748d089757cca267738ae440a294b90. 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/CALVP2489379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e937a48c3e4a01112cca83806676647ba303b4025fa00f1791f4937650fa44. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CALVP2424655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b829941fc6857927174c2719c29864343556f84e7b4c49c172241f7d59e5ba. 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/CALVP2419510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd33d823406ac1037d884b84446c207ef7e56df7e1689bdca271834a812696c8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CALVP2419494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae311922f3243c651400076c2442c2595ecc659cf77227076abff4724c682f91. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CALVP2419189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f4d66b0202b710eada28279cead706d292e6bc813c8490f3cb36cdc23678f2. 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/NLRD52354645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13c4787d6f7d259ff7fdd842a77f9d11261b4ddac5e62bf3b8b1edee913f69a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLRD52321051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1377b8697bd24f22180edc1c7dcd308c00a547d85ba12937f4b03b85e66f97ff. 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/GX3Q92098346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcac035cdfcd6d673d439d8322148d5b05c0c7a6a722d33eb1fab181dc7308a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLRD52118958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb09f4fe5cb4f3fef399270b25ce160e0e37e4a0def4408e495fe74eda22739. 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/NLRD52118961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1c2cf5e292b972431b04235bb320975d386d372525b4d0cdccd47a30fa0d2e. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/SE6A92054375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b0003ef4fdfd852d6c466213a41e9814801b4201ae5b295b7e0a0dc92d5a05. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFF2490806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03bb27091fe7c96cec86669393f55aeb71adb943510bffb2e50111a5fa800f2c. 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/ZACT32100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34370b78e40a1c43405b9eb6636f47b3ae160bb85d38840133cc03e863bc335c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ZACT32100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681a612fb6844ce5db8a51a1b11bf1351bc4304004832295491368a947a70528. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/ZACT32100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ead2a5ab0392e4fe5db32dbf8ec8fbfc579082f064e6410bd89c7a185c06ee8. 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/ZACT32100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41886496d34788e08e93db5b87ad63f8c3ea17dbfbb3918e0e5f735c887dbcc. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ZACT32100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88e67bd2a11675bf0b80b46759e2db7e2f3c513406548bf5f541147182c8e2e. 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/ZACT32100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ae0ac7c5ea29c3237fb3075ec4e052753bc9c0dfc6844b4a0d10452be104ee. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNWT2085689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b314cdba7271096a6389eb4b0b1623f3004f831a8b6ab20caedcc3475768bd. 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/NLRD52118981.