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 0x98bda4785b9716b84c9af00142d79b37e946a32b03f9f9de98491ee110d5e2dd. 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/db26e703-d3f0-414a-9d4a-c2b3c31a80d4.json and https://artists.proofprofile.net/proofs/artist/db26e703-d3f0-414a-9d4a-c2b3c31a80d4.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 0x2dd9812e9555a08ea743b91f1b02e4ba1cf67c05037ea4580afb2f94bb7dc389. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLA552300364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813ead85b6ff964106394b4c46bf57fcbd34886d88d91ebcf451c5a918712830. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/PL3A12300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c2b4020be6628a22fbd2bb3c086f8c7088427615efbf71acc5b4dc94b20fb7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLUM72000709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfb2e4367fe726c3f98b638dde4343a7113473154ac4a6adf093fd15e96dada. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/PLUM72000570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87a86ebba2180441e164c07b02fdce837a45aa05636b035a53801f2be1551ff. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLUM72000487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b186e4f28654092ededb1f6b75ef1022fdfe707ac4595283333c1d9eed3e076. 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/PLUM72000710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b9c875378c911039202c5740b3c661df4cdd75c678292aacd4d0fd0a58b9d9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLUM72000711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9b53bdb7956fccfc34d7a36fec624bd92e09249a85a5c42d1d232c414cc973. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLUM72000712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16475822a61fd5a5ffb7dc68f3c79e0f297d01972d1779fc356864177b39b9bc. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLUM72000713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8986b23e4bf937afd4ac63a29bd39cbfb5e2d2f59bdb54d7e60a001dff052b8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLUM72000644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7568aabba04e855caf578a8a2d8328b99619d015a2c424c06a776d7f2f6bb9. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/PLUM72000714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1755bcb1e93d5ca5946b18ac6de55f81cf7439dd06cbfaffac0cb69d638824. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/PLUM72000715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8dd70b5ed777aa50632b650207c61062e08ce237556b1aee1763973093e3b9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/PLUM72000675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b17bb2950573209a19c7c5f4c40228813edb8e9be9e52bf9de334f55a6cee8f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLUM72000716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dd2fbdac707b2bc7a3f8017d126cfdff584f1442d306371a2ce49e4c9ce1d5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PLC062387074.