John Harold Kander (born March 18, 1927) is an American composer, known largely for his work in the musical theater. As part of the songwriting team Kander and Ebb (with lyricist Fred Ebb), Kander wro
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 0x305790be4d8b92972625dee798b74861a5950e761af58553243ca9301ca773c7. 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/2d8f35ea-fcb7-4b92-a5a8-553d359e85a4.json and https://artists.proofprofile.net/proofs/artist/2d8f35ea-fcb7-4b92-a5a8-553d359e85a4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Overture from Chicago...All that Jazz (Chicago)
Donna Hazelton/Matthew Goodgame/Warren Sollars/Rebecca Dent/Caroline Graham/Air Studios Orchestra/Gareth Valentine
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 0xda57d42a0700d329ce56c256c5d98addd7fd6fede0d16b78a44860896e3b6d5b. 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/GBAYC1105260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9270187cd1c3bdb400c59e091fb4c1645a5540fcec194150575194d3d2d15df. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/DEU901501334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa7b46f61077eb3077031092d76d9915aea2faea384ee78fa86dea88ec47314. 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/CH1609701986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b7083db37fa7b470679c93c1ff572f573cbd26e01862fcc083da0f991d96de. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USSM10407068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ad6fb6650add179f6daaeda489ea636104918b3ece19a5183c60bfb7d9307e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USAT21812313.
I don't remember you / Sometimes a day goes by [The Happy Time / Woman of the Year]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42941e111cef66b91365fb7e9f127c4ceda2a9d9b7e3204797a744ef4ad855eb. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBBBA0240703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934eaae7e4ba14d362ce9002c38c4295d7a3bf2cc1966fbe5ffd42c99a4ac6f6. 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/HRA101104497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38631ceeff8a37a6be291101da6eb92688e8ed66dd8933d9ee350503cd7c0767. 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/USSM10409906.