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 0x88349566a35b04634a23819a8f7a1f18de4bfe939fa3a6f10b5103b5b90b71d8. 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/e1a37e57-55d4-4a35-a18a-b2be3d0c36dd.json and https://artists.proofprofile.net/proofs/artist/e1a37e57-55d4-4a35-a18a-b2be3d0c36dd.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 0xa1cdb76834b6dfd0e9279ba3549091d3ef1cd4db04e1285c762945d62a4dc2e4. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3EZ2437215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe888a6b0c37571cc0b7fedc6d69abbd72d6f9e4564fa1faa37cadd05a34c63a2. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QT3EZ2437216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1a430b9bdcd87cb979c4d0c9c1982459e431688eefd3ecf77170a0f07f33f1. 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/QT3EZ2437217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c0383390a6afd9da44c7d74735a5455d1c44d02c2bc8e08d6b596a121f1cef. 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/QT3EZ2437218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640e29743125a8065b50bca7af4c67c667bdaf0825f705d2cd3636c51beef204. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QT3F22459593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3303b9a1c36b604578959be35b8bebcefaf8d09286ee22e3ac023034910d3534. 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/QT3F22459594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a63f1210c029e933f97612011fd9b6bdf281a3ae518509962cb08a594dbcc5a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT3F22459595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61196dcfed0d45340b5ee71f3f3dd9c7aa2fb0fa6543efcc43e2c06af53e18ae. 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/QT3F32472169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678cdd9e72bfaa2563586da1e065a7885298dc28209900878cc13e5e2c3ba2e8. 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/QT3F32472170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8954a9ae4b660882b8472f35592d9b9ee0c549fc1bd93119d7e6100877280041. 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/QT3F32472171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821202ace844dc295561ea51149b1dde1bf45503a26f29c526e77f519a24c0fd. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT3F32472172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df67af197b12e5183c5396b9463e1db4ab74ceb544e120e70a8115ac0abdc3f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZFYX2593102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced2da1ecaee876bc81d91b18533aae85a1732f1161018b372777139360f732a. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZFYX2593103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce17fe8745c0a58055dd3d579256ee8ac9fd3faa33da96627de536b105c4048c. 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/QZFYX2593104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cd09a7ac9d9918f8cef847e2f07f7181f67a52e8dbe365b6c6d9a599f7c7b3. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZFYX2593105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02627c1a415c5c7aa79bbb3cb1a9f6f5425b80b184b94cff43aac5536a24331. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFYZ2527337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04f6717e9ba2160f2788f882db21d2cfb00016fd85a380c8e48c8aa33c6eb5c. 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/QZFYZ2527338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b58db609234489549e6a5f6faddd3e8bbf67e68550512e85be8b282ea15f9. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZFYZ2527339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6bbfb2f9ee9600703ed462720d215adf507e1712dbd1e1d1f995da0ce6a3bb0. 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/QZFYZ2527340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67492bd43bc16b9ee5d212d43ff317963ac300f93980037da6f4999b5090268b. 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/QZDA42503606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6062fb04a8db22339e791fca1cc3baa13a464f1c038d31d67d2a2b759a790b03. 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/QZDA42503607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec58313b87f647b8cde53ffbc52ecd1e37bc899203bdb3f788ae4f00baef09e. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZDA42503608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4f4d3589ad7b3430a0ce5b07952f72a1ed5f27b10ea7e9d31e2eb9bcd68b83. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA72513242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd759cd9e54c9d729c2cb8d7c536d5b0afba60730d941ac39b5d32b97b635d6b0. 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/QZDA72513243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc660f749ffb71f0d53544956438090cdf7a100387a9b69a5d5b4b1203d8ed3eb. 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/QZDA72513244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87505db085b083c18e680e3b47f0950d27b0918030eb6c34013315da3a7f1ac6. 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/QZK6L2592531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba4bc5e1390aec1d7e3d573e83b9e25aa61cb37faf0796ff6f2f72e3044e040. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZK6L2592532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176d93ddab0670debb18275c63ddeed85322f3dadc17987204c32b76848a3b03. 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/QZNWV2542084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a41fdab7bccd8cac5a6262252a18dad8e23b38cae04e3ad1d2d36000f868e17. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWV2542086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa541afa17d8d83ee0f5e65a8bc640c1e223e442f3bf8b793152cd14cada41b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWV2542087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9861406c9e7b1d164e65b1fa3b90fa71997fdb9e642a300634653120c2146ed. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZNWV2542089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82c5f11b5a3d99d0a68e2c5d7af7a7afc95c4e029088bd5116a5a733d6569f6. 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/QZTB62523335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dd4954c6aed8431aad65e572be4c3e6bee3aeb61523ac4c03fbf1847a5a61d. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZTB62523336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8b4068c5adda688e281a857d4ed966a20b6acf6dae14be461b171972cce104. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB62523337.