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 0x76b560d5eea2a64b9e563323031619900043cf7e8ce2cbb9a14c742872864dc0. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/518fa387-1618-4d4b-bff1-22a85001296d.json and https://artists.proofprofile.net/proofs/artist/518fa387-1618-4d4b-bff1-22a85001296d.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 0x109b3f330f3239adb42427d3c42795026b23c8efcedf3cdaa2ef6e420a8027c2. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNWU2407640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07559f60d009935a74ed8656baca40b966aa1fd0a9436a325d066ed74a1aa18b. 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/QZMEM2499158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a8653a15204316c883b9f6f009951cc5df03cb6ed9ad7cf78ce72dfe674cbe. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTB22313800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe527208c54f3ffcfb789aa66bca842d7a74d602e0ab021b3a694805da57a8986. 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/QZTB22313801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf012f5e17393f93a39d6005cd11355a625f8f614f14d7433d91b3e2812c73b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZFZ32080354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40726e14b1f0cb6383b4dee4c170155114a40c69df5587ab0aa944e039d4826. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QZDA62024443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79eb671c353554cd0046739c6c5e61077319de3e1fecee01b08e58b06c2af38. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFYX2024019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2e23d9cb5b47d085ecef6634fef9a0731e554c639c310dbb408476d370c48f. 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/SEYOK1922939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934a5174dcb18d23516f23e837b369013e7a686cfe27528a17c2a8f92df4b4a4. 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/QZ4JJ1950401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6910e340cf4f6489c2809850291e2f03964f58efb22eb9d8a8687b66998bcb20. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ4JJ1917344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f55063c7a4418a220794cb9b2853db4062560af02356eafadeb34ed7e158911. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CH6541764315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733a77faddff8abedb50ae75f191172a804772bd171d7a20407e9c83400376f1. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHN72264067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f8163595e6f9f8ef3f7dcdc1f7df686a145b29a60842bf4ffa248baa3e2e47. 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/QZES92193672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4709322c2216a6a3003b23147ecbdbe8079d84e4cb20159ed63ef15b2b6e593d. 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/QZES92197404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9cdf418376df8711df56b8dea07faeb876c179b1cc04af3d657e7ca21c533f. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZES92185313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c76c410f7024430748047d628f8a5cbb6bc01a53e2d5d6a623126aca7d3554. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6K2097526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6310f25b0f217725c4a8c13e36386893ec640c67788f7d0d4c1dfc528e206699. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2173645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15d4155cf2fe66b6ecbff5f97bd5d964d1a432e595d92bd9f746c245d224036. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMEP2173652.