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 0x49472aa259bf34ebb939f0398d8519c5301e53faa9d7faadfea413562fbca372. 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/86835321-d5d8-40ce-88c2-3f18071287e8.json and https://artists.proofprofile.net/proofs/artist/86835321-d5d8-40ce-88c2-3f18071287e8.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 0x2c09f939e681074b6c0538f8b105b4b84d09179d5fda4778614d659e17c82b89. 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/GBSMU7181763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6a82c5c61a608771f984283a7050956b76ac1c75d1073241499dedb29d1802. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GBSMU7181766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf5a6d5cd65bd43e77b477d00b86799d09053932f8880df9a58b51c1ddf41f. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/GBSMU7181770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf080312907748ce29c8b21c8bc96e5e12d4d2315d9535fd5f8088b9aeeb40008. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBSMU7181771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2139ffb55cba302fdfd8df8b7473bbb1cc2fe7828f22af1cb3b1ae6c4882e653. 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/GBSMU7181772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75b4e33c0941d5991c1d0ac0ce92b10352a61352f09206a6f3e981948ccb2d7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBSMU7721726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eac5e6c7f7a91ee2a382787af4e1ad9a670657127eeca50be084239d7a15735. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBSMU8358493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c30e499df9ed58a50e9fda23ffa3f056469ac2328b5109d8bc8c239614f5e2. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBSMU8358498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b1eb9d11c9873cca20b927b2280484da107709223335389be437b44331e60c. 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/GBSMU8358501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ad1610b22f5a5f30f8220d5eeaf7e916c5ed2f1192be658840c0ee33784bd8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GBSMU9046971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48c177089e8b308d878a0f5154c266af9893508ae3aefff324b3c9b02580310. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GBSMU9046973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b5d25b03cea153341796d9f8afa366a903d6d5304f1b6688241563d9aa5fec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBSMU9046974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13053c8aad691600619293c51d90589d30fbcc3271d0dda16a292a50c769f51. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/GBSMU9046975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab927566c8587ceba6fe25682386abe728e21f0b6dd4082ba6a5754a576f0c9. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GBSMU9046977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126d229c8eecdafacdda8e2bdf135cf8d92d8e39bfabdc0aafd2be4a457f2eb8. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GBSMU9046978.