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 0x27cb38bf5ea411310cc01bf7b27ae3bd4d626f41c34fe572938f903a81629f9f. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35e98750-f959-46e3-b7d9-b478ad281724.json and https://artists.proofprofile.net/proofs/artist/35e98750-f959-46e3-b7d9-b478ad281724.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 0x9c25d3459dc7c9d8c31d56f701f228b9d07788389246760af56c6a81ba0dbfdb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFN2309504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f9d0f9a24185fd61d86c49a1a1cfbdc4628a4694be410ad7b0d8ffbaea78ca. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZWFN2309505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5319e3da1b6b0ec54fc0e36ecf4eefab92a692085a1429da8483aa244c6c7626. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFN2309506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e1f12e7dead7d31606dff4d79c00e6144081d5d19dbb6e1da0be992e650535. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:43:49Z), 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/QZWFN2309507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1af06a81be0fe64f14e9e5f84e82dc19bcffdb3e03d8fcc3cdc067ab3b94e7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFN2309508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef45c07cd9caeaf917a07a73440e2d9f5ca1bc7d57609d35b66a1b07b6812984. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZWFN2309509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296d14d6a9844621809cde8c8c077fa820dfa1e7ffcdd3144895d3d5b804c894. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFN2309510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcbdd4548d4533639f80e417806508fd65b057a3e150144872594f2605f89a0. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZWFN2309511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238530c5584e9cb1d3aa8252cddb4912b3a5ee6f87d4aa05a5e46f0e256188d2. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:32:13Z), 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/QZWFN2309512.