John Powell may refer to: Politics and law John Powell (MP for Cardigan) (died 1590s), MP for Cardigan John Powell (1645–1713), English Member of Parliament for Gloucester, 1685–1689 John Joseph P
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 0xab8ab31b5ad4e3baee216bdddf7d4e69f765e18f860f46ead5bdfa801032c62a. 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/58e631b5-8ded-47e6-8f2e-3fe94241fb31.json and https://artists.proofprofile.net/proofs/artist/58e631b5-8ded-47e6-8f2e-3fe94241fb31.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Powell, J.: In the South / Sonate Noble / At the Fair
The Moon and the Superhero - From "Hancock"
The City of Prague Philharmonic Orchestra
The Definitive Superhero Themes Collection
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 0x5106776749d2564274d21639c7c243c95e24efe85e6718310f35da271f174d49. 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/GBAJC0800212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce70a66c52ca0f5f0f2b931e4ffa48278691fc4d88f659c39945140a9777fecb. 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/ATP131406009.
How To Train Your Dragon (Arr. by Ton van Grevenbroek)
New Compositions For Concert Band 83: The Ghost Ship
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab69726a10cfd9fb2e282b80d82aa822dfab35b9734c91e067b7f839ad8715ff. 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/QM4TW2117597.
Symphonic Suite From Rio (Arr. by Erik Rozendom)
New Compositions For Concert Band 64: Yellow
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b97a662b10b7373e323fb6116f149d00aae8086b48ac014885037b1100941dd. 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/QMFME2091119.