John Field may refer to: John Field (American football) (1886–1979), American football player and coach John Field (brigadier) (1899–1974), Australian Army officer John Field (composer) (1782–1837),
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 0xeeba42c00d2934387ccc07309ebb11f473a85385b193a685cc409fb46c0766b4. 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/068df31a-c460-47b8-95e8-2402ac62f285.json and https://artists.proofprofile.net/proofs/artist/068df31a-c460-47b8-95e8-2402ac62f285.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Field: Piano Concertos Nos. 2 & 7 and Piano Sonata No. 4
Piano Concerto No. 7 in C Minor, H. 58: I. Allegro moderato
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 0x2f92dac31ebfef65853e66a76f1b93ff8ed1fd80612d6ebac1bd3b8c084f608b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKI191420501.
Field: Prelude in C Minor (Upright Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2222a32945791704afbfa23fd92209e3c441ce9fd4df3db0c61f129620a6dc50. 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/DEN962302420.
Piano Concerto No. 1 in E-Flat Major, H. 27: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b543607ebf11dc256aa0a9c622fb19a075391cff35aaf667cb701dc2f64c09. 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/NLY330904678.
Piano Concerto No. 1 in E-Flat Major, H. 27: II. Air écossais. Adagio non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43778115f6abccbc43f85a0166c5647b23b7fb216e97a20155d367b940cc366c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLY330904679.
Piano Concerto No. 1 in E-Flat Major, H. 27: III. Rondo finale. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d06507cc59cbcf2aaf717d7e2da0adf5ef58a28d730a973028fe3f8c1904646. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLY330904680.
Piano Concerto No. 2 in A-Flat Major, H. 31: IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa709c35f6ec45d52cfc5769be02ea63f152bbdf650b665bc620bf73300be0010. 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/NLY330904681.
Piano Concerto No. 2 in A-Flat Major, H. 31: V. Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46431fc9cf6e7f0c2e7bbef034ce4e999785f344f92965556b8eae22224b8bb6. 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/NLY330904682.
Piano Concerto No. 2 in A-Flat Major, H. 31: VI. Rondo. Moderato innocente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1a42fc063e0e05e67cf02ea429289a99c68da7f8334a2a0755c03dfa3b5e0a. 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/NLY330904683.
Piano Concerto No. 3 in E-Flat Major, H. 32: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414c5368f1286234a7673cdaaf1b722c76dcb19356e713eee34cc6dbfcbfd16a. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/NLY330904684.
Piano Concerto No. 3 in E-Flat Major, H. 32: II. Nocturne No. 2 in C Minor, H. 25. Moderato e molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6924203f0a114cc3e8efe017100a24c85738a739e999de724f62b27ed622db. 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/NLY330904685.
Piano Concerto No. 3 in E-Flat Major, H. 32: III. Rondo. Tempo di polacca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55f9f15baaa110ade52c5064c146f595af265de0c4857c9bce42623585b5989. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NLY330904686.
Piano Concerto No. 4 in E-Flat Major, H. 28: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bd618e6f8030022a1fc16ad5fca5d820095ea84ac6f8a803c56405c54b2b36. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY330904687.
Piano Concerto No. 4 in E-Flat Major, H. 28: II. Siciliano. Un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1031c45941139951d42447ea94e75bcc269e76a0e1507b9ccb60fe0b8faaa513. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLY330904688.
Piano Concerto No. 4 in E-Flat Major, H. 28: III. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a0354d2b3de06e4ae449717d125dcd3549ff1ed5061e366c0126006ec90120. 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/NLY330904689.
Piano Concerto No. 5 in C Major, H. 39 'L'incendie par l'orage': I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b982dd1884c2b11bec8d7ec68afcfd084674c856995f90bc242afb3bdaa14c. 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/NLY330904690.
Piano Concerto No. 6 in C Major, H. 49: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb26bb339fa165a207167b146d60db0752dcd1329dcf7add7b7e39e7ea3d4bc. 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/NLY330904694.
Piano Concerto No. 7 in C Minor, H. 58: I. Allegro moderato maestoso - Lento - Tempo I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940f5c808e726261d000a199e1ed9946dbac14e230faf18a1ae9aff54cab1c4f. 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/NLY330904696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173a540b811eef001913cf3745289f4d1be3c0ec36ab3a664b659f2738338f87. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEN962302430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb624e7d05191504ead1ebd1909dbeaa4b2c7fac64ddc5bddf6e0c42d875d71a6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLWD1602908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a52b2395c8a22c2e962605150e7928c49732e0545a5060aeed94a074a4c4a59. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEN962302160.
Nocturne No. 1 in E-Flat Major. Molto moderato
a calm playlist for reading, studying or writing
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9c85faf40a95321b47f17efa676a50d287ad69ea8b66b9ba0c3c0f6d3e514e. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USTE10301199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e330c064e6172ff4695e3de1b49c592d8606ba9926a84cdf0270a256fc9ff92. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEN962302100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2222a32945791704afbfa23fd92209e3c441ce9fd4df3db0c61f129620a6dc50. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEN962302420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ba6473047ac397ceee9e6bf535cd4cffce7028abcd361c9dc68e12f058ee9d. 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/GBF071504650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ba6473047ac397ceee9e6bf535cd4cffce7028abcd361c9dc68e12f058ee9d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF071504650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e94b4b8b60378b00c6ddc2022b82df9f9228c7a33879000a6e5b77d1212f808. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBF071504660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac779ca1b4896ef4563c5fc9a29e5df1e44e41f5aa55775f60db91b74ce3062. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/HKI199751605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c4fada4b237b28518892d749fbb0aa380b6b7f35c8921c4d0d58f0fa31927f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBLWD1602904.