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 0x8997bef790e52ec1cbcd4cf5eba393289a9bf422a333a27ceac862f852bd7d45. 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/f8e385a0-0fa2-4858-967b-b96e5e9b960e.json and https://artists.proofprofile.net/proofs/artist/f8e385a0-0fa2-4858-967b-b96e5e9b960e.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 0xcd1248dcd4a42725f8f45830371372f7edf02b4060e9afe34e2428436dbd0d40. 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/QMFMG1523020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a18fcd769250410bdb7f315419cbc93f1b5236373a5ad86749342f223fd84ff. 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/QMFMG1523029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c61f8c896ef73b7e37040460cd96fc6fae484c44cfb0b1d7de80f49fdd1cd7. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QMFMG1523071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd7b7e900e41dcf2bb9235625d318b13e2756a56582cba4aa61388d0678cb3. 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/QMFMG1538217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce3c197dc62ecc9b1399e5c35dcef6bc9899394a1dfb303f89beeb5fd58719a. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/GBWUL1908198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c61f8c896ef73b7e37040460cd96fc6fae484c44cfb0b1d7de80f49fdd1cd7. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QMFMG1523071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517b4229097fc355c51dc925d95a50ad9596d0a830f05fb0ddce6839fec90d37. 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/GBWUL1950626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa244ae335cb4921c316fa023766adb531b34e4f2fc0ecae41911d02caf300912. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMFMG1523021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c61f8c896ef73b7e37040460cd96fc6fae484c44cfb0b1d7de80f49fdd1cd7. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:08:06Z), 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/QMFMG1523071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372923c16adb7ac31588ba98e5eec2458be4c0eba19fa2acb2011342e4421ecc. 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/QMFMG1538196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd7b7e900e41dcf2bb9235625d318b13e2756a56582cba4aa61388d0678cb3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMFMG1538217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a149fff3e4eafdafcab42b609174d51d13a7ddaef9fb7d8ddf8a9e9d6a0cd7. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ESA011579881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ee2531ce8dbc4fb037326fc1c8b1c4286457523b104522cb85130bbf0033cd. 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/ESA012282226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ea89ed16e160b2b6fc9bb701eb859e09225a69f0a20abf4843c6e6eb57f141. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:35:49Z), 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/QZTRX2395732.