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 0x26b65d82a01c83b63e0f46c62e73414d0b2a4147f9350a4dfecba09341822f21. 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/cbaeabf7-a00b-4309-a534-e17f2b08260d.json and https://artists.proofprofile.net/proofs/artist/cbaeabf7-a00b-4309-a534-e17f2b08260d.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 0x0f7dca5650c4c56201854edd0d618275d830d59bb0ed0657920f6a8c2bfab06c. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TCAFZ2246111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de6026a9e901bf64821bb92876fb9e1a80faa06415c5ba420b637d5943fb3a1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFZ2246115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42358f889235803fd8c7d7470e433a21cd1c97a24ed5981f24f8a97e439c1f3a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:19:37Z), 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/TCAFZ2246140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35943453f43affb309e5b46c8a3bbb586e13aa7e3afcf042627a69905ce618b8. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAFZ2246389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b465c745ccef59e886ae3e39f890be2688dfdb9c28f31ff0780ab3d4996bca1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:39:13Z), 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/TCAFZ2246433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23c703a16502d352189f5bc3db1f2e7b50e685e54d996daedba820a422b7af5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAGJ2255559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11862efe4cabc8b5fd79a21db733a3bfb84be586e4eb6279d0352b5a15005d5c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAGJ2255581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8982e4c8c230f9725796759ace08c05237aba56ea3f90fc0442f8d75a5121977. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCAGJ2255589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34d68777d8df87f86c07aa9e2e4fb041f6f84d72c62a41f12cb195e10c3856d. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCAGJ2255627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede0db0e0bc8b61f3ee545b58c157ef01ef3de085d076639204c80214b205f3d. 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/TCAGJ2255651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5f2b4f2ba6a3cca355b9c1f2283694582a0967f690bdbed2f2d4825e131584. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAGJ2255667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe2a68385494a1e290b9d00fe5fc95e5e73596154f77be862e6781cdb366ce7. 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/TCAGJ2255788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8cc3aa3fb5605c25f146d0b4cd1c73f953b0399a841772522128a31ea3e97b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6J2222576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5e3c54031a1339d37ec38374304122f7829e1efe0594c19028441326fd2890. 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/FRX282354959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6afd2702f032808e3e1478708982f92eaf83ef7205c72308c7d310360b9b3f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRX282355044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376ea0495f2a4f31c747f6921b9b545ff762e16ad4d05aa9188c5d0615ac24be. 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/FRX452355327.