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 0xc77b7c52099b1bdf772ca05b4dee84a1a141cc22ecf961f5b057bfdd3fc53443. 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/ddc7a160-9a93-4bcf-bc47-ff2c8d8bd154.json and https://artists.proofprofile.net/proofs/artist/ddc7a160-9a93-4bcf-bc47-ff2c8d8bd154.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 0x644c41239f2b0ce902878cff1fecf3a9e4a6616c1f852aabe415bb5bd911ee9a. Chain 2 (Bitcoin): anchored in block 957702 (2026-07-12T12:25:41Z), 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/USHM81653424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e3cd8fbec6f4e47cc5b44c6048ed797467baceecaf609057f628604f93bd35. 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/USHM81653425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82008701395cf3712961ffbe3cf310f6b8229c51fa878d417b081e028d8364c2. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USHM81653426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbe68507def1d6adae705a72ef5b4cc08a60f8c37e4f7a98518b126f724fa35. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USHM81653427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e52e64ce2b279b344fb841f95ccd77ad2fe9326654cd9278ef4286e28a4fc9d. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USHM81653428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdd51e378b9ea2c166c333f2f0aa997423636c0841445140af483f6e59977de. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USHM81653430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676798b7f933d0050bd4c6f15b7825a3e367cba0a04d82896be49be4fe3015d3. 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/USHM81653431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52fbc1f89de16df36a7b567ca4a3efced3207c41809e769d5a08acbff7ede1f. 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/USHM81653432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263b86855b5490085ea748315ada8e63b9c1ba1c1ce511fe96c6423be26eb2d1. 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/USHM81653433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51ca6520b7b76f7bb22a882502aff11f384397680916365b982744422957f93. 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/USHM81653434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca490e4eaf742527e3f6797727015398ce55779c7c4be1a4abaaaf163256c0c6. 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/USHM81653435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484bcbc542bc72d0ff1fdcdd29b5efb78363bf2eb84d6a25c5ca9234d392b976. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USHM81655797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1462160a4bf725c4408eb4b0fc674acbf57310421213217e95e1997cc209e8b0. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USHM81655799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9b51ff303448fe048bea5cb161c8cebe8a1c4e7ee7bf4bac65968e5b2dc0f7. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USHM81655800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2061714eb8b12fc952b95cbfa843df9498ed8ba2cb6e4cd0afaeb09a64b9404a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USHM81655802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d71a00ba3e8a0d9c3ca6c27b16c379c279a1e835871f314a4130e8d4c4f073. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCGJ2356366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af042e7452d7fe00205576a43d1df7dcf817cd9f0448d816e9de68573ab7828. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/USCGJ2356367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57d05ee36d0887552b6757ebfe7c1bb0d8d6e63b5521dd1845e53b1c2072cab. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/USCGJ2356368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669d912aee62b4867d2faadbe9bb728276c7c91aca41d130196603abbaed5717. 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/USCGJ2356371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd989ad3fb3128ed79f0a56e2eb7ae98108f5185300addbc836965ee97f81fcb4. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/USCGJ2356373.