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 0xae4081ed6a7689dcb677ca157db3c1f1b6d4b342dd6cec251de94a23846344bb. 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/5a0074e4-65ae-428f-9c40-bfcfdbf66b64.json and https://artists.proofprofile.net/proofs/artist/5a0074e4-65ae-428f-9c40-bfcfdbf66b64.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 0xeb33fadb9baeed5e0354600f66f44ae13028ada9f43fb94af65e49135edea530. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/GBMA21803645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22cb773c4cb289f06f55dcd1e723c998fc1d27ad61737cfdd9ed005d6a583bb. 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/USHM91253029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b2f5122597436d67d8b0f2322d7605e411692e5da9061ec5e570946b40c27b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM91253036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f759e3744a6f45a4ec3488031a3c6edc9dc3c2850a533e70bde5584e02a4ee. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USHM80324479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee011b80d75160ceb19ab4380bdf3d8b93740a62effb27311cc28ed77e9ee7b. 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/USHM80324482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9807329c30e6bc4f8ce74eee32cba996ee20d5d32007104a662c961870cc606f. 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/GBMA21807441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fcae3923f2170b03aca05bc20f67e1485e3a4777f6383257a524074515979a. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/GBMA21807451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a30752c805855f6ef3158d7002ae33fd5ee0288885bcc98fc6dd978a0e70716. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/GBMA21803640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dcc2836b693733c611175ac338084a8a9338698d793904df633c5e6b6c4d0a. 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/USX9P0956524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27141355188318997be7c018a9691e5f7012f76e3d0c05864cb0661a82caa068. 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/QZWDW2362155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cded0da159f09ed2a3decaecb0dba8f0fe042f1f7b14dcaab26d1775699b7a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM80324483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a647e86627fd66a5999496bf1cc2aac57321ac7ea70a693bfd1c28dac01a25. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZ662469205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a647e86627fd66a5999496bf1cc2aac57321ac7ea70a693bfd1c28dac01a25. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZZ662469205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b15745c851ecf6e255dbe3a70d9bf101a94699b0318333c2541f0729240eb1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TCAJA2443263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc012bbd5eb5737261156e2bab0dcb0a4a3f5ae7da9e4042e16258940249e8cbb. 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/COF012222056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f843ef57da729fbbb9f150819d82d95f49bf1ba62c9acba21cce1999b64c16. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USA5F0910179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea36e202a1bbb7645f1cfc1156b8c0d4c8e053d738beb043bd50a158ff23c0e. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/USHM80324484.