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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 0x925e0677ae009cf5a15fe39a196ccaa0289de92bf6ede57f5c8544b1b5d7a110. 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/92718d27-6f1f-43f9-beff-e9a62d17a2a0.json and https://artists.proofprofile.net/proofs/artist/92718d27-6f1f-43f9-beff-e9a62d17a2a0.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 0x5999354f1d2f4c8c12be8e6d8637de575e3e8f446f1248132f0fef8debb83e65. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBMJG2021469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacb45d8da69326ce3fe766d2a19c87ea46edde548762a11bbfadc2541019e9e. 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/GBMJG2124223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0eb34d09c5c9556628ca652d7ee8c8418fc6d5b3238fede339de65190b2a9b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US39N2303043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4407221eb7fd3abb5d2ebcdb505adeec745e474e3657f951fd2c1525ea25b87d. 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/GBMJG2229328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0004602cfe9df01bdeb87a1c145a742a67d831fc48b922b774ac44c8415db923. 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/USZXT2454394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdd82df827cfb0aaf7fb195bc7efcd5a65932f060573fafee28b182b34c4f6a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USZXT2454034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c360116362d3c981ac044f8656f0c31b389b4ad1022f639b75be755fd1c0be8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USZXT2453627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfde53cc0ffe9b7868593a735bf54c649f2f75db59dfd121df8ba5a9caa1572. 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/USZXT2353196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a56b6cfbd512d3c2183779c94aa166b199efad3c1a96ac26f90716cfbf1220. 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/QZTVM2339529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f259c06b4541faa33d236995410bc5532ba45adb3b02932902c3966d78db7ff. 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/GBMJG2318211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0eb34d09c5c9556628ca652d7ee8c8418fc6d5b3238fede339de65190b2a9b. 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/US39N2303043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdfc582c4fc2b57b162b71e6e1e8dfff4b0a24c32993580e4635df31bd98961b. 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/US39N2303044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45602972407fc126f1d9bb6b8e7669a93097bb2bb2f18502021da6f2a44d1810. 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/GBMJG2225944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd5506154ed6a1f268669453a7261dfc126aa8425d7c25226b1e5ace76fecc4. 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/GBMJG2221757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79403886e9a16c434c08668b928d6ff17b004d2bdce188ca52f44db99c75ccda. 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/GBLFP2285080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f988c8691573ee39ac182a643afb53e6495d6c5e3a80dc08ea94dfe771dffc. 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/GBMJG2209182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d05eac47cb3c5113815366653832f523de9cd6e6c888025ae4abd1bfd735687. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:04:51Z), 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/GBMJG2203825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87f9d8b3ab72a3449c1d8c862edb6565a5d9112f799565fd2995eb7a4de4704. 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/GBMJG2120483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a626250a242ccf654f9cb305af8bbb55ee82c65a6216364f862e576cda3760. 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/GBMJG2115931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222904002c12be4345a51efd662ab71dc63e49bdf90765648c4b841f4eb57d37. 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/GBMJG2111810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9308b597cf3302e5ea95e2f353dc1e14d82a53ff0d3fe43d006546633df319b. 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/GBMJG2105300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a5b9cf061aae8814a041bd517953226dbecd9d9ca9df6cf6b8a32743145c44. 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/GBMJG2023758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdecfbe2f192a5509f67d91284abe9aaa175748ff8b3f95d9c37132be318a97a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:19:14Z), 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/QM6P42028127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e58ac13c3d892817e2f2d86665878af0019aecee4f36ab4811c37dcbfaa004. 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/QM6MZ2085575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f7c69003912bffc4e63cf24f8cd57b121202116ce04489cbe10e3ff036cc45. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBUM72207177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476463019faafa002e15cec4e83c59b182890422aca104443c1d1c29e53261ec. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBUM72401689.