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 0x579a6846b1399f62b2619379fe1086399fa6be58fc720c70160642533e8a64a7. 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/bc3045a9-3840-491e-9ad2-cbcb97cf8900.json and https://artists.proofprofile.net/proofs/artist/bc3045a9-3840-491e-9ad2-cbcb97cf8900.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 0x887f9332aa1ef6d9265b097248e620e58be94138759fc5f8e884007ddbb8bda0. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T06:53:42Z), 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/NLCK41038253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff05523fbf190bc19ee170614986492cd577935c990caebeaaf0c11df77deb25. 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/US83Z1783461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0640b67f5cc45b40c50c9a4eddf694937957ee6cde82446980857ae1f1c988ff. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US83Z1786281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32b601bc7865778c2f810b4bf72c91c35ed2d56b39ca0e8303c9db782a6fe50. 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/US83Z1788671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae4c8b9fe575f498dbd70ceb4ae0a67cbf65f06634db1a320ca66af0d7c96c5. 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/US83Z1900745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe3f72966c58d7f931a8f0013393052e67edb33c8d5c0a96cb3b74c470cc6ff. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLCK41056119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7385bb56ac2558cc3bd96a32c9538eee4f3446fa7c0c8eda4cf08a73de118e32. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/US83Z2017108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404bc97291dbd3bea2a95f0a6dd45b280e115eabc418100c7184039dccbf174a. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/US83Z2035338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2fe5a4e807b70e20cc01f319e523dd9436e942546a724ee423f167d238d3c68. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/NLCK42230447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5d32a147bf5cf5fcd5e0ad7b850b59f77aae78316689d54b23a56b8842e355. 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/US83Z2341620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f10d534ea211ba784481ca399c7d31dd6e82215bba68d2c3a813c1a3576dd03. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/US83Z2407645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727afffd200ae3a808771e66b81f77c4a149dc8c603a485bb28ac817018e6248. 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/US83Z2423300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7b4ead8a52a5da7993cb9d2aea53ec2266b990d03a06a7ec1a9d021fa18a3e. 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/US83Z2518978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07ae32cac3249c1167c7afa54c8d442dd111c83bc6c6d1992e819a6436f6f64. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/US83Z2524567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c17e227bf47319acf1a05df9fca5bd48fe89c9c767c2556432fc4654ea48125. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US83Z2532315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0f2a45d1f241ff101b8e3c174329ed898a0f3e963cbc54fd0edb327d762c23. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US83Z2532316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4effd18b9eb9d5702cac383289e64baba460c7c9ef48553a8e7ac45d32b62fd6. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/US83Z2532317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35475a8df1fe0020d4e90a0763aae52c7f5a589c6de4bc9fb84f6cf066166b4. 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/US83Z2532318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464b8e24b95f617a5cf56975fcad29bbd3bab78b86d5cfe2adba4b6f38c22a5a. 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/US83Z2532320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af714ff849c724b6e966ee97d4299dcb8a20aaa8eb6d31bca5c5c90106bcac3. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/US83Z2532321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4458c53fcf26da3e0b19778376c3cc569ae6489cb6be7dfe21a323dc12033b55. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:22:45Z), 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/US83Z2538816.