thumb|Portrait of Johann Christian Schikhardt Johann Christian Schickhardt (or Schikardt; c. 1682c. 25 March 1762)Schickhardt's death was announced by the rector on March 26, 1762, at Leiden. was a Ge
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17205171024286cc4bc643e8bd28defa1b348e56da4eaedf70426c4b690724ad. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38c797fb-3917-401c-9710-b86c5ad1eb8b.json and https://artists.proofprofile.net/proofs/artist/38c797fb-3917-401c-9710-b86c5ad1eb8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata in D Major, Op. 22 No. 2: I. Adagio
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6b5cdaeefef17c056a2070bad0cd35d6bc5a61511291663003e1885e545819. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEB202145005.
Sonata in D Major, Op. 22 No. 2: III. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bca5419c4e7f569554083e173d94accf5f087cfa228fb1e8dc9354d0a036f1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB202145007.
Sonata in C Minor, Op. 22 No. 3: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf5de2924bd9426d85d12abdf1ad7848b9ffbb91002a9dd6dd7cb37ccaae605. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEB202145010.
Sonata in C Minor, Op. 22 No. 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f77fdea33fb9f83bdf9730d1f7f314be3515a30a48ea98de348941b2abee67. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEB202145011.
Sonata in F Major, Op. 22 No. 1: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8358f1f55298402280da896f3c56bae73adcfe9841d686309b484182690e29. 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/DEB202145001.
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
Sonata in F Major, Op. 22 No. 1: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8230086cd324a406522dfa227fb0d5f24e09b1822382b9b972b4cffcf682e741. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEB202145002.
Sonata in F Major, Op. 22 No. 1: III. Allemanda. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8085bb394e61e08e5bfe48d25a19bb455bc77313f2d84a86109fb1a82ffc3b4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DEB202145003.
Sonata in F Major, Op. 22 No. 1: IV. Giga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb6ac60836a0d09ccb79002c462837b4dd0cdbe357a0808849954ce9825d8bf. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/DEB202145004.
Sonata in D Major, Op. 22 No. 2: II. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91537db8b253ca4da4735fbc55f74ab8dbb9e51c3ec5d650da43e8a7f01f4c93. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEB202145006.
Sonata in C Minor, Op. 22 No. 3: IV. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b13561aeb5e507d6f5b126bb62cebd12b610456b199fdabe07bf5f31e9940c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB202145013.
Sonata in D Minor, Op. 22 No. 5: II. Rigadon. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675bc52b9aeb4d8120602f08e8585744504df02cde796d7782ded3728c79f8e5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEB202145020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ae8cf3a9dc1889a143ae4e1d8cb14d194a4b30abceef81a8ce871ec56937e9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR7JM1962170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b31dff3586e31c1604f213dd5cc519d5a65bd7f83e62abf06aae3409fecd3dc. 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/FR7JM1962180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292944bdedb9a237ba45be4f901484927099a307083585b6c4962e795d23992a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR7JM1962160.