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 0x160f737a46c7bd0d46e7ef73f5465fcbbde4ff5f0408104dc00a39337cc90f03. 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/d62340eb-377d-4ec7-b897-b3d54cbc901d.json and https://artists.proofprofile.net/proofs/artist/d62340eb-377d-4ec7-b897-b3d54cbc901d.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 0x21e1bf998f67f9a963ffd111cb250353208fc5e1e36066713d956396ffa6ee15. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/IL5842238051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbf388cc1c19aeb5c152d5e314d6f604b2c5a3d4847ca22846db851f4cd681f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/IL5842238875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5964e91a94a7e725ba87e556281b4fd079a11c649230b69a37559b2423cd0f5. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/IL5842341422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e1bf998f67f9a963ffd111cb250353208fc5e1e36066713d956396ffa6ee15. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/IL5842238051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84646984e53847497774fa66459ebfa22c3b3a1bc06b267798cf31de3099bcc7. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/IL5842343251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3430de557bdc86aa6c40350fa30b153a0e0a9a374b7e16cbc61e34ad00257b27. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/IL5842447064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18862f9c3765e98a9dd83f611f7a48f3117a4744d2e523a6368c6e1096a09b28. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/IL5842449150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec08df3adc22b9f073a01f6254d82712bd72f90fe5e3e71e2b1f7bb20e30a10e. 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/IL5842550100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d780245e0bdd7752837b503603d240f19151a5ca60b3e52e2e0233c0e3d49f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/IL5842550824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a67f0043db57a1743f085b7a81c6cc68af2ac74af2394a5a2a475d286bdbe0. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/IL5842553515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204e36e7837a2186fb0d993ecc6a256bbad60219823575e6ba2371ff84c2b928. 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/IL7532413388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4c64712cc00e61362dfa85aef0154959b4078a61be5dfb4a13cf14c6807624. 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/IL1012400814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4c64712cc00e61362dfa85aef0154959b4078a61be5dfb4a13cf14c6807624. 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/IL1012400814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4e7d54b1c80677dd29242f88652e673cf959682f20de800528e64311a0c099. 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/FRX282285954.