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 0x09842a3e18f179810b9cab577b39c3fe977581eba1eebfdba0bd84f969c2fa94. 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/c121c8fa-2ce5-4aa5-950c-eef38a6c94e3.json and https://artists.proofprofile.net/proofs/artist/c121c8fa-2ce5-4aa5-950c-eef38a6c94e3.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 0x39f036c94c07ede0a836459db9b4f98c41a1ddaa3ba4e6a82a38153c949e579a. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/DELJ82076253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bfbb0e15e13e314e7ec292a0fcf132d4b37cf85ef2f3b388306b113f197aaa. 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/CH7812061982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa120d9d4e478074eaf520f65530f7263c333fc5a306bb375af289e2c53ae08. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/CH7812060283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4a0bfe88aebd92537ee7b3763127b87c5907b12d58d0d8399f94957567e49a. 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/CH7812074365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ec620e50c90e3c6b386194e8001fd22ba4debb4539e860bb3a1d50d6a7de1c. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/CH7812180933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57735faf1f8bf9fb7f33818302255da9f65180b562f1be1160722a73a6008ffc. 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/CH7812177757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4218b789250a6a6b9825118f5ebbf87e2a31e6091e5e13f96d16b41d1bea93f3. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/CH7812188242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2271a2c5a1850fc3e4fafd18d238c77c44363f99a3853f89e2a7ce7dbb48b206. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CH7812192162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81134ad150e6c738b6d3a1532ee368a4ef8d045c5085c42300d9c4d28fcd66cb. 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/CH7812192590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96a2d964f3b34152d0cafaacde9d5483e4e7a9dbd8ff6c21e77242504166986. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DERK42100078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0e8d0c87958b641977303992594f21922679cda313e7173e4018d62db4a4eb. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/DERK42100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532220dedad1d1c53e39a56da12faf0eabd9f8922821fc286c57a2db021d6b3e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/DERK42200065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e4ec4f786e9d4e5dca1f87ae08ffa55eb33ead184a5664731b824d595e86cc. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DERK42200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9452de1cb732c8bdf7482055f3426d08793904b5c2a3ef25ded8eea318089fbd. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEQ022282888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565e194b5c9a973e41414307da13c2af9c35e983c7034ddb7cb8158cbf7847d0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/DEQ022274660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd98f0b013e612cc54d89c1b6f18a403c819aba907aac52318e86c6ee6a0491b. 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/DEQ022291764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c245b9b57c1124ebde190907625c1f1df0dddb7cabbc91b8f4c15161d3249e. 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/DEQ022291962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8392af7c4e8715fa99ba62684fd26ebb9805d7268c69c1490924ba3f15581536. 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/DEQ022371386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b58e0a9a4aa0ff82566676b9e1feaec101b20ad5fc47c5d56cc77caf4a62e89. 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/DEQ022382368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d182490450a0d62403fb3e59e3fd62bdbda3c311e950ceccf12510a5ddb1e8. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/DGA0Q2312003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa3e102281e88a75a7104452206247e6e1325aee1acc27d05168f90521e4bad. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DE1CZ2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b7b4aa7ec12f7342d52cb7a9b44731d843d278e460307d751944e83617f4b8. 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/DE1CZ2300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ee191fd6ccc339a152fca3e66d28e6a86d2309400a0d9b16f8d03fee9670bb. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DE1CZ2300158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7019986d6521fa17577d8a73165608dfc243447d94c29100b2fd05f2d1220e. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CH7812365915.