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 0x114e1ca7e0afff5ccd1ea59c4c6ee44953b7bf3550d4077cfd2ae909107b3612. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae048d04-b1a7-4f84-bfd8-54a4cfc27f45.json and https://artists.proofprofile.net/proofs/artist/ae048d04-b1a7-4f84-bfd8-54a4cfc27f45.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 0x71a69bb9add4e987fba5a9c2dfdb431ff9d535f9dfda176994b1bf2340791372. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZRP42412178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e35eb8e3518a865dcf66f8aff303298d8eeb27b6f39bb50f92a6f24d0d6ab33. 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/QZRP42412179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41a117eedc9d27a4d60a6c05d39ee6643b9c02ad91fdefed8f2952273958daf. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZRP42412180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3e946bb852b30e1ae1f36f5f1ca4a931dead2aa2d254502441c3eb953e360f. 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/QZRP42412181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3e125af7ddc1ab90301f1e3d46fc368e3d9eebad2681afc7e5ed01c7389778. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZRP42412182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40987a139cace5886c100a0d0ae9ff8f77ce4418d7209bfebd07a2318c38561. 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/QZRP42412183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139d637f80622de3ce3cf318a8d03c3483086aadeda114cfa90a00f8758eeeb1. 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/QZRP42412184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf75de2ee2cd6367719b5655cf20df130cd1759d1b10ecb4b5e9687523f96e69. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZRP42412185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5567a259433cbe059324dbbc0e9b9616fd0336b552ea7781946fe14238c9ffc. 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/QZRP42412186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b23c18b5f2a7a13c9ebde911a85711dc5037a2a1a3d691ddcf12578a64dfbd. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USL4Q1949667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f6b43e2ae5b611beb6fae5db06e28fa64c87576c72bc22c1f57f93c6f766ca. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USL4Q1949668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef8713c18bf4e9a8522b3eedb32836b64ed3c92de6fed440b967d87ba24ae95. 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/USL4Q1949669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca495626c32bd3f779840544033e7bc086dcc2daf18b6bd3efadaf0071ca7fab. 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/USL4Q1949670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754f3e0b9bb4549c9facf82e470b46a93f6831ff5e646ccb201d55a900f8ab2a. 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/USL4Q1949671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8073197bc3e64eb97f540276ef6568f191004013033f5966f1771b3231973537. 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/USL4Q1949672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12f7e130dd7e96d1b47008527b573a237cbbe1e8b27b14fbb8f87b129332413. 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/USL4Q1949674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd0c2f16ab8221e7744e0cb73466e2ecdd66c163826edd7fe2f992de751d97c. 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/USL4Q1949675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e45c6f51736ab6818160ab5a3b46c538677f34e7227644c700789f80cb318f6. 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/QZNWU2164045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe292045027362e5549c6509f6fdff6b414fddff1ee35f9e1510555bc0e21bd4f. 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/QZNWU2164047.