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 0xd67574e2fdc9e2012952320d3f43df1eb348980f23809de02944aee3f47188bb. 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/2bd02181-e275-4a07-8bba-1452422a037b.json and https://artists.proofprofile.net/proofs/artist/2bd02181-e275-4a07-8bba-1452422a037b.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 0x4d1d45c08a2372d10f4338be10e4e080c8b35aac43b237d60a71ad8327826bea. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ5FN2127014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8b8a0b1991b47dce6c3dcf66aae79c4f2ac60596339053300100cddc717aab. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZAKB2170506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293403cff2cdc9b18dad9ed46173b0f5066f95f283ce602567fedf27f100c0b2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/CA5KR2345595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b48b3cdf1b7aa21f2ff00ff757c865b8f783fd32290f1305790bd327cf2433. 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/USLZJ2425559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb928ac11cced6baae23035a11c4a5baac7ac6819fdcb9e54cd97d8640afc63ab. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USA2P2425529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887fdbcdebb7152af3f8fa34f1a55a4bba031893e42d85ddf52c296e8ad4a96f. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/USA2P2457681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a860efdf8ad2d9ffabaedc90f2669581c68204ee07304657cdea3d38a4800d. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/USA2P2461356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1782d48edbc88950046808b71ba18d015ecafc24c3099b564f58d60e1b00286. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/USA2P2461370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228dbc3f6700d6e3cecf65fc12fb3f77fdfd2d37761b3ad3337375f33c09ef46. 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/USA2P2475649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06aa062ca9a2836c8ef8a1fca0adccffb06988b1fab0c46c086a7951271cbf6. 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/USA2P2475660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4991ef7f8f1619d310be5ac956aabbc9cf31c6440aa6204f01d5f4916d9b8da. 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/USA2P2475664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea896be04837a42613d876a32f2b7f7f7e74d0799d987ebe37e97607aa067f02. 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/USA2P2475665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7c7f2af3e5141ad5f635a6bb4ce3818217a8e995fa37e8b5cd5dbfc352a86a. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/TCAJG2563191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107df78064e7301c188098d084c86917c1874529475456a7279c4bb9b46165b7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAJF2563230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91c7ef3126feb5bc33a08edea6dc32b0c3568a252f179937be14608ca971a96. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USA2P2502030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a0437a79f5aedca1efd3ec658712b6087c1b013482ab432322d05cbab19bee. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USA2P2502031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5940bc115cc353f9cfab61ed117b8f4e943e844c8acb15fea7b4e21cc1d08ed2. 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/QZTLA2549770.