Kai Schumacher (born 18 November 1979) is a German pianist. He specializes primarily in American piano music of the 20th and 21st century, as well as music for piano and electronics Life Kai Schum
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 0x96b3308337392074f824ee3576480a45ef447c2472d8257ffd342816cc79173d. 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/e839da77-c1b9-4ece-85e5-2c0d1639ed98.json and https://artists.proofprofile.net/proofs/artist/e839da77-c1b9-4ece-85e5-2c0d1639ed98.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xd8acae8f990899315cfb5390ee85b3af1045ac14ae2df23bb4b5490f0bc5e2a1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DES380023292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a21b04bae371c8f65d4b20fdef0032caaa07d81d134f796239947801387d8a. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:01:25Z), 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/DES380023293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8745074fa70c999bacd5bd82f84ee80b987d0ac54eaae8c18a9b7cbd8f230ab8. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DES380023295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd124d60a7c23828b6978b6fd76c4780032b32c89e37c491a699f4bd8d3a4eb3b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DES380023298.
Hometown - Arr. For Piano by Kai Schumacher
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc18ae6bdc9e7943db3780239fff888797cfe3e7f5026a10c933c8380e301d18. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DES382415001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4c0c474791291067f4cc33cdaf5fb07a8fe4278d01f4f5937d4a6493902a17. 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/DES382517007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9941dffc2d31398ef5e171bd5ef8fc5334e72d8b3c5260421a496da72580a9c2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:10:45Z), 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/DES382517001.