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 0xfa33669098630c6aeccdd3c6fdfe26653b34f72541bfda0581c9c038fd51d972. 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/89f33b70-4d17-486c-8b5e-75f88821296a.json and https://artists.proofprofile.net/proofs/artist/89f33b70-4d17-486c-8b5e-75f88821296a.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 0x448e4805936bd94e140ccef52b5b60caadd99f4b8f8d2103e62ea1c7fc56ab9e. 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/QMFMG1514659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfbfb5e16c775c022a4703ed96f6e9a994c3997f80bf62a8ed1526746771d58. 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/QMFMG1514666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529b91082087e162b15d3c345b1043bb7876ff52d81427672c242d40eb058f02. 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/TCACF1522497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3fa5d65bf1b62257c7245fa56b9fa7f2574d4708530a15c9d29a8b84010231. 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/TCACF1522499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5002a46df8b245cdb7b89f62333220a7fde0e43fa67f46becb07037365bba25. 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/TCABF1279046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aea99d685d80a627370bc091b7b8909a4c27003b570ebfe2e0a704518fadbf5. 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/TCABF1279058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5dcc9a5d762f432e82f23530c0fa1bfa45b352e43d71102c05f42eccc31bd8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCABG1299782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3505850c92c6eec94663c896246d370e269ec9e2fa72969c9b3806f20fe3e07e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USTC60820816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1a23c0691908f699225978cd35a3332ce8617f46dfa1689c8997eb1b575c23. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USTC60820862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3038bca195b6a39a5dac14db5f6a4e69228352bace6a65b3238333e619e8adeb. 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/US3DF2239663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d119ba40dec588fbd841c5294898c9037b4b92aa8084103316eafeed62a550. 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/US3DF2238790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a963f3ea6030553a947323773ddf84e85fa77f3cdc7967f52404fe272258eb6. 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/CAFEC1700058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f88ad216a9f70a5abbf494aa2285b38d975ab6352ed24b16f99ada469c2d6e. 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/CAFEC1700059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc905669fa82daa9fdf48d050919dc9664d46f473c673fc4c118d64d9fc214733. 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/CAFEC1700060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905b08e7269f9a36babfe9608c30613a3fcfd7ef294948d859e75be154a60aef. 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/CAFEC1700062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c16ebd79abe47a764089e1bfd32b2d76c835ae2ed2cf889a0dcbd90d46f552. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2274111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6cb57b5b72efc1240248cd89b790e28ae4eb2524d4f8fa7987585ca3373e0a. 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/FR96X2559696.