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 0xa9abf52932adb433608a775691473b6d578443a7a50574281dc73abc45e10e6c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d9bab25-9cf0-4d25-b42c-6f124a776e6f.json and https://artists.proofprofile.net/proofs/artist/5d9bab25-9cf0-4d25-b42c-6f124a776e6f.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 0xbc422abec945a6bcc10e0ccc6d5638b337284f0c20b797df7c2d43eb6810987b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM4TX2127963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765e61dd33369ded677ddc40353fc896c854c99dfa59bf7a020db19c8bf2b0cf. 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/QM4TX2127964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb992d8e9343cc2a0cfac4f6cfa7d58cc5f15491b2ad5a1d5c14eafe56f76b0f7. 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/QM4TX2127965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e0317543230ef4fc0b55026c4f2b365bd51ba32fdb9e08706086af4ed59621. 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/QM4TX2127967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d58ae78b6d0e077449ed14632ae9a2a03d4fdb7e0fdd7aca36d6fe528c9306. 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/QM4TX2127968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf32e48a013a9cc17908ea838fe8f2c02ffc70d28619873e2ef3a5afbe24068. 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/QM4TX2127969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d46b5bbbf6091f3fda11f1ce6d0103b9a039386582c3e45462c0bf4ba29d95. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QM4TX2127970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df41b63560a2b83a5df696a051cc3ccff8fc15ed8e5e4a5869e757012b21bdf. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM4TX2127971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2533f27f4e140965f2e607404e5e8d94d528434b6b03adbc174186ed1a815fc6. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QM4TX2127972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb15a9872906a933ec37b1fd89049474170878f2cc668d102cae3aa415d15f95. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QM4TX2127980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62330f5e1b85ace7f7536735c3e9db1bd554871522fd7d5fd87e994522182d36. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QM4TX2127981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984eb70dcd2a5a723793ed0b024b9171375ffa59527e96f6f74d7ad79ef77604. 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/QM4TX2127983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc909513b5c2ed0e1636fb5cb7876448c293ab7687005d3d2a736a2f581a8629b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QM4TX2127984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78dbd2883d73482cb67ad15270902f6a4db5944dedbb5117d523094baa28080. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZ5AB2438766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2074b471120170080f3fdc0c378be3192fe59e1d20439ea3aabc010ffc4059. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ESA011852514.