thumb|Vladimir Sofronitsky in a concert Vladimir Vladimirovich Sofronitsky (or Sofronitzky; , Vladimir Sofronitskij; – August 29, 1961) was a Soviet-Russian classical pianist, best known as an inter
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 0x5a566f42100b06759313494183a8ba22f63e42570a70d266b43fa51ab8428ce4. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1cbdba16-acca-4d9b-a2ea-67be12f88344.json and https://artists.proofprofile.net/proofs/artist/1cbdba16-acca-4d9b-a2ea-67be12f88344.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Scriabin: 150th Anniversary – Piano Works
3 Pieces, Op. 2: No. 1 in C-Sharp Minor, Etude
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 0x7ad54e41c61469ce317f045691d4a88626abb99e31ec26ba28feef911c69be60. 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/DEAD62210601.
12 Etudes, Op. 8: No. 2 in F-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fde898ba304b20d7880c807d38f37156ad8d960489e3b79e0237e414131b677. 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/DEAD62210603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e43ef0fe0807db2d6cd56a3521cad5751868e805a138ff6f81d18c3d839c89. 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/DEAD62210604.
8 Etudes, Op. 42: No. 4 in F-Sharp Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474854c9726f49c38ba6f536ae7b70ab053b7ab9e3bf354dd6440c086475e66f. 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/DEAD62210617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231916db72d7baa9a3488d025f2174d166798e1f5aadcc7b40d3586a541d067f. 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/DEAD62210619.
12 Etudes, Op. 8: No. 1 in C-Sharp Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6adcc50f958347c23ad765edda443b3163b606f5ed1a1b0c7307b7bd6db48e0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEAD62210602.
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 0xc851240075892b135bda02b26ef74aeec5c674253aaafb9efa027574986179f4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEAD62210605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550f86441dbfcd975a7871527b9b4455390a2d695b5c08abe8744730db7d040a. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/DEAD62210606.
12 Etudes, Op. 8: No. 12 in D-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe90770dbe2ef7a7d3c624c88b136cebef131706e924c6cec4309cd1a2e080239. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEAD62210613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de318690e9a30da06694b440a61426dbe8de7e1d538552425ad0bb5afc69da8. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEAD62210614.
8 Etudes, Op. 42: No. 5 in C-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51366a83169902ecb1f79e3076bf5f3b3ac885bb5d380de2798f8143207d9862. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEAD62210618.
Piano Sonata No. 2 in G-Sharp Minor, Op. 19 "Sonata Fantasy": I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc42d6d8d745f1f1302efe6cb6a4841ea760e6505bd361f41e29384b5e8e978. 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/DEAD61500702.
Piano Sonata No. 2 in G-Sharp Minor, Op. 19 "Sonata Fantasy": II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdeddac07ef68f7d2d4699bbabb4ac1eece0b8281e812a4ab98ff02deee5b164. 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/DEAD61500703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af03257124c5fd26a1c31c5a5844fe00b24afdbf99293e8608336956aa11133. 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/DEAD61500718.
Piano Sonata No. 3 in F-Sharp Minor, Op. 23: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf142126e401191efef1bde6d9f6a310a1589a603ec6a7fd3d3c085c4f5002923. 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/DEAD61500705.
Piano Sonata No. 9 in F Major, Op. 68, "Black Mass"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80de06456a07570748691e4c85f42692766455bf754938103338ab63c6b6c09d. 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/DEAD61500719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b57bf89c591d5d41d2c7ddf942b1599422eb5bea0210a76a094edbe92df4a2. 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/DEAD61500721.
Piano Sonata No. 4 in F-Sharp Major, Op. 30: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8a0a88683c65ca7156b9bb0781a1fae3c718298129c0a7202e433c490048fc. 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/DEAD61500708.
Piano Sonata No. 1 in F Minor, Op. 6: IV. Funebre
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d179bba6ecba797c9b21e027c7b76b89bea4dc95c1500bdd55d5dc242ddaca7. 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/DEAD61500701.
Piano Sonata No. 3 in F-Sharp Minor, Op. 23: I. Drammatico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e47d14fddbe08449d474f23fe57e575ea0aa4edd44bd523d433783cdbef21af. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEAD61500704.
Piano Sonata No. 3 in F-Sharp Minor, Op. 23: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ada70829481aca608ab5afa91c86f1a63e88d0e4105effb2ec79e1041fbc99c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEAD61500706.
Piano Sonata No. 3 in F-Sharp Minor, Op. 23: IV. Presto con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd23beff781a7452cc340204472800c0e858bb9462c03a690cacb6a0e514d14. 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/DEAD61500707.
Piano Sonata No. 4 in F-Sharp Major, Op. 30: II. Prestissimo volando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e2bcbfe30f8f7fd7a6b8862e0e80156b83861b508a166d9e346abeabd4d391. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/DEAD61500709.
Piano Sonata No. 5 in F-Sharp Major, Op. 53
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc96238208f746b974050350646dd3547bd49ab302396f71b3d7188246c1a0b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEAD61500710.