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 0x7ac41b8e2029e43d8192f96c534504372a1a5cb6dfa21bd177df4e0cc35f3e7a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84d74348-52e9-4782-8b6c-01acfd29db88.json and https://artists.proofprofile.net/proofs/artist/84d74348-52e9-4782-8b6c-01acfd29db88.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Muiñeira de Piadela (with Carlos Yoder & Nicolas Perez)
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 0xf4dc8f27a30fc2b881b0f271ccc25c0812ca70d6475365a3f00304ee82a1bd88. 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/ARW0N2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a824ebdcbeb8cd41ce02980a0e2a57a60909ab571003006ed07a7641ac9f039. 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/ARW0N2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b164189e5d3175755fa021aecf52046444b9348291b37718aaa8dbaaeff972a. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ARW0N2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d50494502b16f2b2f42262f166e050aca4901024977f32fa94602e2df732ca. 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/ARW0N2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d2d890bb90a765fb990bf8bbcd57ba332f35f04c4dacdee5a8a65fe63e5036. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ARW0N2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6121b6c8d4c9c7d2ca208106eefe9522f646fd19ce0f4029d42c5e8cdebb520f. 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/ARW0N2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174b8fd0401425ad155fffc776e79a05958b607c7053aa23ef8b14d071ed5929. 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/ARW0N2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bfc73a5fd3180ce9a1932e3b23fe7135ebf5b8c5a2931e2592d2fba4e738f2. 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/ARQU92300001.