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 0x6a308ae6fd82b748630895466bd5df5a11ad2c976529054e98f1af494141a780. 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/4371957a-dfd4-4746-8917-f236438ec468.json and https://artists.proofprofile.net/proofs/artist/4371957a-dfd4-4746-8917-f236438ec468.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 0xae521ebc4fe01bf830bcb333f25d29a47ae225a2093df61f7331689313c6a671. 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/US3DF2038327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cc9806561f2e326f8197f0cc19926414b0bc846d00e9bdaf4de89137979562. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/US3DF2038329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4496d43f8345c2bff7b29cbe90c6d97be291e198d95ca4df01041a8b1ecbdc. 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/US3DF2038330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf808e2d9444b627b7e6326f65ca3f0a777a44a0597632047051333579d4ccc2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US3DF2038332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ffc8b8e0e824c1a7602e53092791bd218f14d02c51647aca3b313f2615989b. 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/US3DF2038335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7c89f8794c7d814fca3fab11c9de0e084f90f6c5e61dba00c245dc21dda373. 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/US3DF2038448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f666b339b2bf40f3b1478f035286cbfedb18fb0a2002a3a16621812173105d. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN82111881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfa345333ecfeedbc69cdbf521873c3e837381af53a8da59088f6fd833e7497. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T00:05:41Z), 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/QZMEM2168676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4058b3ed33db388e785c578276f6c5fd18d8fd140cfc5a4ba91a1ab367438c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZ7781876990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199d138e47c17b82b5b53dbd70485a318a501b5ee0e04f3221c08993cfe961e6. 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/QZ7781876996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fba73987f739f830019105ee022902b88603d611a64d873b42ae5541699613. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:57:35Z), 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/QZ7781876998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdecb5cdf68a2010000731b6a602cc528055fe4d0f951d55085e23cd62cf4396. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:07:45Z), 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/QZHN52371612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3a48182b73ed68589753c8c93d62377ebb3da0e15b23981fdbd04bf442b3b9. 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/QZMEQ2330314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb73705933eaa8e417da014f1aa9ab6b5b244d4423589c9a5768c1f53ced25ec. 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/QZHN32496404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891b142fa68427b7aff066f29f0da377a93bc4d3642b42c9b2facba23b2ed3b0. 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/BGA472419320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec2e96f8b06ee25e3f9523cbff7c1969736f1f88c2aeff6684b3730b8a74f80. 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/US38Y2590034.