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 0xea1a1468f76af63c44608dff4b51b71b64387fc8a4ea21183e6641eb65c01d71. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/380283e7-9b2c-4172-9d84-14b4e9144484.json and https://artists.proofprofile.net/proofs/artist/380283e7-9b2c-4172-9d84-14b4e9144484.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 0xeab0bdc8e86e99438f41aa93928d9ab7c12eaf3f658c6e9ccacf31bd3860264d. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZDA42170267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa079e6480f864dd817e9d108b5568928cd493a82a2f6b6914d55f964e2b4a3e0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTB42287612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eefdac4b68974b86dbaad12628763a28fdd2db79a025bfd61b330037dc1d0a. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZTB42286635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ec92b88af4bacd4116f98bfcc258d4947cf9390f140f7ec58def9861e38c62. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZTB42286637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752433b66d63da8c67d5bd4e463d90ef77f3fc61a45850d7ce17d34adea03c1c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB42286641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77469521a5ac4118000e2a8aa725ebb50b83fcd23b484d186d006f3957aea11. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZTB42286644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3b8e74d463a0d561070840833b71aad422bbd3749a872a420ae62f0c37d241. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB42286661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a34568a8a5c08809c6a3e1d93b51f45dfc22aa51d6d3557075a589612adff7. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTB52254829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f892401f4e528d78455bc4ad7a1cb6eb2d4f30400c6ed019bb7abd4ead5d5ca. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZHN82311969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bef0ce8bdf17cd4e7c4f51d5dcc7690f4b519648ca1d349b3ea75470cb12591. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFYX2444591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1680e4b1069d2676b7d64c85d876780cde61a30012588b54eebcb69bb70424. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7K2471044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e683da87a5399501c88299a7f3c2ef8a9623e74b2bf77a494980c94e0003fa. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZZ7K2471047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c16b068bb23995361759718016db13f8cbb1fea0329b7b631d67bdaefeced23. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZZ7K2471048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe027422d3cca81323ac35f754452d3623e0f2d6cde706471fba0dc887be85f5a. 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/QZZ7K2471049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2fc9ff2f487b52b78208b44967d51cf615e275503089c81609de11993a9d02. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN32542268.