John McCarthy may refer to: Government John George MacCarthy (1829–1892), Member of Parliament for Mallow constituency, 1874–1880 John McCarthy (Irish politician) (1862–1893), Member of Parliamen
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 0x6c48143c1e5a839280f973d2028f75cd68ec02c27bf6ab058fcc28595df44c77. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f98f147-9ce7-43e7-b75b-ba3928eb2bba.json and https://artists.proofprofile.net/proofs/artist/4f98f147-9ce7-43e7-b75b-ba3928eb2bba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La traviata, Act I: Brindisi: Libiamo ne' lieti calici
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 0x9b3387b1a1a89472ae46c26568a52dec7b58ca4ea07b54cc15f7346c9e39de05. 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/GBAYC8000072.
Peer Gynt, Op. 23, Act II: In the Hall of the Mountain King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19963078ec1a25feaad59b7d5cfb7cad7282beb20ad970d107b63acdab367c13. 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/GBAYC8200237.
Messa da Requiem, Part II: II. Tuba mirum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb417c503fabd9f5482171d06accfe3d5389986ff8026da659b95d7815614c9e0. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAYC7900222.
La traviata, Act I: Libiamo ne' lieti calici (Alfredo, Violetta)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3387b1a1a89472ae46c26568a52dec7b58ca4ea07b54cc15f7346c9e39de05. 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/GBAYC8000072.