Harry Groener (born September 10, 1951) is an American actor and dancer, perhaps best known for playing Mayor Wilkins in Buffy the Vampire Slayer (seasons 3, 4 and 7). Early life Groener was born in
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 0x014b1364a4d105a452a5d15761ecfab8e8c2d4b54fbd04e4377c105b70115d14. 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/8896f088-a61e-425a-a035-eefe28080f09.json and https://artists.proofprofile.net/proofs/artist/8896f088-a61e-425a-a035-eefe28080f09.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cole Porter's You Never Know (World Premiere Cast Recording)
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 0x3a1c21f08f6ec626d0d47cae8d3065aeeb7738e9c59050d7b2d7285f27e5c0d6. 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/USSK31781927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfebbeadef6c1801d975c4b0a83204fee7f1b159e5e63016ada5a2bb766b48b8. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/USV110300095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063f152f1ffd31bd367ce637dff2c133be6a9a795734f06cd124927fdec89226. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USV110300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa5d0a996fa873c82fa818de1ebca3f3ff96d211f6292de879614f2ca45d2c5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USV110300104.
Cats (Original Broadway Cast Recording / 1983)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdc0384c3881e456c38f66ac4e241186d67813a81459395ff59dbc65ae6adf6. 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/GBF068990035.
Growltiger's Last Stand / The Ballad Of Billy McCaw
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69681ec04abd7715279187a4f69c433f8f697e08ecb0d3117d08e8bfa6ccb555. 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/GBUM71704126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9be99b204e13980a20abf82a2d3c45cafe19bb6c207c8b9b93d6e6c529b9284. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBUM71704127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9820044e3f6a99a591dac0fd2732808b40475ec978fb8e09f4ee5cabe8a81db1. 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/USC4R2217755.