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 0x5687f15f4d92100cd95711f23906a8e4a0c80113ce86c18b3e94e8a70e46f561. 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/5de8619b-f03b-4ab3-b02f-c0ce34e1655c.json and https://artists.proofprofile.net/proofs/artist/5de8619b-f03b-4ab3-b02f-c0ce34e1655c.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 0xbaddb16b4c2c0564371d9f9b7c6b6e4696633cefd87684f165d350979307d53c. 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/QZHNC2244254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a8e7e4797bd7e7427edc05804311d427af500d4e378e36631014cb00ec14cd. 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/QZDA42479039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a55b1f38e69f4579b53e9cd7d92216bb2bc0749baa5e58decf1ea194d8f453. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWR2428503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd9dfe25469e4a06a85753e5e20bbbaa630959d764ebcceeab50d7d59c1ee9d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTBC2427878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c56c7a9f894f02ac8081ca6e140de78d0b2ae18092a3aea8eb978f1a5c343c. 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/QZTBC2427880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48bba347e8a9073f4d981a2f5eded64d717db8ee3ab8933f5c57e4d5d79b963. 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/QZWFJ2424442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784434e7315f1ddc51cac1c42d7ee3738ec7c10232ea3eebb122a52f96ba0147. 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/QZWFN2425129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0eabbc34c9dbe895f564bc852dfaa43b14306ebbe19696488e1768f60fb14a. 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/QZWFT2474202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb83665d21583e032ff15244fcf559f944e93efb552220215f958fa9ee794d96. 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/QZES82577201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c26d3cc5fbc912227f0fe752689b5ea5799617bff6ed2de606cee1d52cbaa5. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZHN82546366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49305aa17db0b0d72b0655cae35738571f193c28d8f6ee99b338f66861caeb33. 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/QZNWQ2543034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b71a623972bef7dfafd9ac4018a6db59efcb9c358b81c6b30678600196b524. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAS2516899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc703f10a441b180006a85c0370d6f1e971bb9a9f97dab47b26c3ddd0fc7e1878. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ762539632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbc0c3f8c1ca170ce700360237c1253f5789e1879c16fd4ed79ba7bbaf1a5f0. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ762539633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118054f5d633b8200a8da42f00f4933fa78fce66f3e1952b15b669ca1bf4952b. 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/QZZ762539634.