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 0x28c46e966eaed6ab90362b53380549396f192b35255e5b729a822d286c6301a6. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2345273-edfd-4552-8b26-383a4a9078a3.json and https://artists.proofprofile.net/proofs/artist/a2345273-edfd-4552-8b26-383a4a9078a3.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 0x6f664e1296941e49d6b7285612803838519243bb72458e5871e9270da97f043c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZ5FN1940508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4858572269ef20627980cc0e35f1d2d375ac92d04540c4cbaed0b5a2b0643222. 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/QZDA82216982.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6befe98879e63d2d57378af0e10839a6e1f28a94278349bb94f0005ada4506. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZ4JJ1948438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c6fcfd7c1cea8569fe157dd5d395ae7b44df75906ee09223a71a73bf347ffa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKQU2500325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a078535d44140f041c8c7d6e620b37bb7a1a65ce512457286b75e67b25567f9. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU2500326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70ab51a0e5e8d724c8e85b5cac32536fef2b092124299fd5e4945ceb8beb0b4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWS2244144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4b7bc51bc8721e7431b015ed9078a7c687093e6f0ce5f3dc50946a652b97e5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZS672150063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7dda11eeb3f780d7cf336ee3e579b6aa68ed019c46563538e5d7d804625555. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM42K2016565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff53c1a689cca2b068331bee1280ec3574b8a23abe7b39223c58d0b64144990a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM42K1984153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfbd6a512ab3f85824a55f04ec3a578e67471afb9252ea6064011838d9c20fa. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLQ8D1900630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c7b21156aac5db9c8e54bbc6fb05c3df5e97a83fe9a57185894741b32adc11. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ5FN1885011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c52105b447c8b50d52ceac7c7f189fd48842ee756c34382e8c94d5a7480dd1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM42K1758301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276e6da2373d4eeda777274efe5a4b5c9ce61578f911af0538775730604f4612. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLQ8D1700330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25786fddc7009b09304c49cda2928df17115bf59b670fac20e377f167f93792c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBKQU2203726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecf5527bd18303de3e23890031fa6e46fdf7bc93ece6715d64ff888cbc2871c. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/GBKQU2203727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df0b230d4e8341d37f08f9847c306879b5bd62210ccff568c8c15e23f2e80b0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBKQU2203728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51916304ddd441d353648aede610c8b2beaac69d28d2a075f4d0550ed79ba08c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBKQU2203729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbdd7bd97fa2d403aa9e5241ac763ee2bebad08bd8c1b36c8e60c7dea07ee5a. 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/GBKQU2203731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61edcbfeccda41b5abf1cc53893e87ab128f80359ad7d7e1600f83af7dbc8093. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBKQU2203732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee154a48184373962c488d33d76088ba7f1f240a418886ce2ab678da4d5c1a6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBKQU2203733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9c06e88463cd39732393e2e995a0df715c998885474c941427afe0ea01950d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2203734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb270f071369af0a8bb0de865f9a330c0356f75d6b008fdbfa8b3930f85f666e4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKQU2511218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cfc8cdd36cd87649af666b340777cbf495ab9702fd6cca5bf520e320c352df. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBKPL1977957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5564b28ca1eb2dd4b472e32e39137358a1347cf095b1c078d903582aed04a2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKPL1941255.