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 0x48e688caca0d0e7a238e1e57758e1bae41a13f8194e5990533bd4ef60e7cb12f. 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/a334e97d-1809-4905-a267-0b08c6069e40.json and https://artists.proofprofile.net/proofs/artist/a334e97d-1809-4905-a267-0b08c6069e40.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 0xd33921dfc55f17be8ac58ab924b5509e0f0e3f04f461b87f4217f99169772b34. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USA561345283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e97b94eba09306d2d25b3ab6f59839a038777f146f49eab88e8a2d8928ad21. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USA561345284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93260406beb030e22ed41f33841aa86fc415512a7ce376f780526ea1580f3ca5. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USA561345287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5882ed0986a2d7c2ca36973dd7a110ffbd17585740a757cc6f8b13db081ffe. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USA561345289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c68d2827167222b4cd398d842413b6d3159362fcc3a00aa268a96ccac8c8606. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USA561345291.
El Sombrero Azul Por Los Derechos Del Hombre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9616de54e6b762a709c0d46dfbb9af9eef981784b14d5c8153bdb52c1cca9889. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USA561347353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17acc2950aa737bdb5fe1561a2b09bb06e0ccdd719725b71cbd268c3324e18c2. 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/USA561348611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4232072c2bed558e49de04031d42f6b08326dc09a8b7b2f8ca43ba4be20c46fe. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA561348615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471e29a47ae88200197060e82d6716e1f28dc5b2d2a23542e4cea0a3ed9bb06e. 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/USA561347349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6402181b2ad4ba77d105cc1aff3a81544ac76f8e21a041f8330a6337c684ab99. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USA561347351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71dc28e6cb023587e8b1712d662a2f558586d3d32ac0268bad788374b04e2ec. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/USA561347352.
El Sombrero Azul - Por Los Derechos Del Hombre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd948a81f25f3395dcb629680eb2caae025bd826badd70778af4532ff0e46874a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMBZ91418655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd3d86fa2078d323ae2af6df2413666fd9d9acd0750171a6956378f36e40975. 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/USA561345282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10093f894a970db23914830823e4779db9206d9072db757cdce4f7dde58ebfd2. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USA561348607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17bebeabff3a28570917ede86b3849e1436334272099a7b82fd9bf0c300ce8ba. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA561348608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83227da2e5f4a8fa3f93723ba7eb64b878500cb51c74e1eb0a764325bc67f45a. 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/USA561345288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4094540ade9dceca92320023ba8dc18b7fdbf63435360723d57f7c342882b798. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USA561345285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f048d39a5b0f884bd44477447ae0ab423dad5e04fd026af210886a1e09faad2. 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/USA561345290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83095271d2ef9757accf2e1c3bb4da0ed95b81431ef94d28036ac54f5946fab3. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USA561348610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5882ed0986a2d7c2ca36973dd7a110ffbd17585740a757cc6f8b13db081ffe. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USA561345289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e356af7f0f68729a27d8ab1d4d743c4a0afd32991c2119a898c05c6148bd94. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/USA561347350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9ee18de44fc0635c710f814939a8e58a64ddd7904f6b4854891ed0a1278259. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA561348613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c68d2827167222b4cd398d842413b6d3159362fcc3a00aa268a96ccac8c8606. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USA561345291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5bc76cdb2dec4b5bdc67b6578b2954b06d3d7442a15a79141c6035730943d1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMFMG1394732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cec57d002817c87841f3cc90099da426d2ab005f53486eeec311f159ae2f96a. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QMFMG1394733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f38dba253d5bd684bf4a735e6d1c558c4a12ee68880a0e2d406309d3946d07. 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/QMFMG1394735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6f112bf315d05d8eec3bd3e86b12e3dacba5755c03f3170a27fae4b9e87f78. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QMFMG1394739.