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 0x75205d83d6b0c8bc4d6fffafec6283723fa14c00ef151a5856bfc1cb7cc27d00. 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/5d0eedd8-9e76-4c46-add0-ec02b83a7267.json and https://artists.proofprofile.net/proofs/artist/5d0eedd8-9e76-4c46-add0-ec02b83a7267.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 0x3d515ad93829d989747eb0b7ca21a854dfd2136341d0a699b0e1db02ec0ce929. 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/UKXN22562943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3ed9d7d6a41a47e9a429cdca6830004c2d32da351717aae8c2761556a41d83. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/UKXN22587979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf631b60228b80c8fc3507c5898822aaa55a9aef5ca52ff89f2bbf5a6d831710a. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/UKXN22587982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0e3077bc067ed8fdcc449eb57bc21b8de8571f3338dc0ef5ad00184ae1797c. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/UKXN22587985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d49b0caff92724d6fb3589e656bea60efe0f9b4967d6667f0b29f55446941c9. 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/UKXN22594239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39c78a2880483fa9a9ddcc8e2062a1dfbc8f9f97c76a0df7b1bf1ffe2f064f8. 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/UKXN22594240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9a12067351ac3afc4a5bb35a690830c10955bc1ebf0405309840af8c2e50c4. 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/UKXN22594241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f2e3e75d850cab81ead70f4b6b269f4aa6f21408042ee4bdb1f4f3964b4c59. 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/UKXN22594244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf2a399c78dc21fb250bf435063c5e70676fc42ae4d03e28349c2c6ae38a85a. 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/UKXN22594246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9ea967d3d0e838d82b1f78580b5a64562846c8dc79b526d4c53ccdc18ae16a. 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/UKXN22595246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe401d463824404ed2a517e2f908de350abd0cbae44e18459905a927ca3e92fe7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UKXN22595251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b13825be3b52ee68c4c051f08288d54f472f00f99f8483dc59867d689c4b52. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/UKXN22595252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad021b0a54bcf3b17b1cd27b54883b6bd219ac8781d1f42a6227ab432533e2ab. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GX3Q92505843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd188aaa4af8ba18e1c5955078eef25ce34a516c424aaf44e778f67edbe0fc7d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/GX3Q92505844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c714be1df62446aad04ff900c1bc045a724a53f07ee5afee420be118fc334b5. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/GX3Q92506007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cdf4fb3acdda05555d8038bee557196443e3837b1eba3d83f3b1a63c6298ff. 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/GX3Q92506009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cf1af1d6caa0c69944bc28a7991e8891b60e5ef976c017d85af9055b1e8f22. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/GX3Q92506010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6a498682babe73bc6dfdce40d109ceddc4b4d7debd8d52e46ba82885b41334. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/GX3Q92553886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e976ac78281f8f752f3faf74a6d4bce6a6baf6744db6318ac7f37c22c4caad. 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/GXHND2540118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bd106ddee564c3ac3ad935f750f314846d969ce1bc872a5a2100095edf293a. 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/GXHND2575549.