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 0x5a3f90788a0db072fd93562853e4f05724dc117598dad423c199904f8810b4d3. 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/c31c5461-38d0-492b-b427-a812698ad2a3.json and https://artists.proofprofile.net/proofs/artist/c31c5461-38d0-492b-b427-a812698ad2a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Horn Concerto in E-Flat Major, K.495: I. Allegro maestoso
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 0xd236f389a3ce45f0dd166da0606b153d31e47ea429f06df73b5d6ab8319569a2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR50X2293701.
Horn Concerto in E-Flat Major, K.495: II. Romance. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8568e2fec65cd569cd4c911c9b6d1934781a70ffa04ec4cfef61da8a63484e22. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR50X2293702.
Horn Concerto in E-Flat Major, K.495: III. Rondo. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0c26ff45ef3e3b988d00dee0fff759d0758004c6b1243ecc818662aec335b9. 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/FR50X2293703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298f646dfef3f73a2b40b14c6bf05f726197373612db45465c1dd27107e67182. 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/FR50X2293704.
Sinfonia concertante in E-Flat Major, K.297b: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d47ad21f0f72240225c5fd10bc8731b542b0fe1ba8dd18168a8dc312d1c424. 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/FR50X2293705.
Sinfonia concertante in E-Flat Major, K.297b: III. Andante con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c384de2806524248b1f3f122de12fb1b2a91ad390fbcb751dbcfdc822f47ce9. 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/FR50X2293707.
La Bella Cubana (Arr. for Solo Winds and Orchestra by Jorge Aragón)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf860d7500d13bc642e8d1de5a6e99e447bce9fc653aaafb2b5df801ad2cc28c. 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/FR50X2293708.
Guantanamera (Arr. for Horn, Trumpet and Orchestra by Jorge Aragón)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002078f04b78ad39edec69024ffe1d3e1071ce52f23727223e446056efb258e9. 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/FR50X2293709.
Sinfonia concertante in E-Flat Major, K.297b: II. Adagio
Horn Concerto No. 2 in E-Flat Major, K. 417: III. Rondo (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3270fbc69e9edde866a4eae12dcb9c6553a3ca56e309ff20d65371b344113210. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR50X2287803.
Cuban Dances for Solo Horn, Strings and Percussion: No. 5, Sarahchá
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967da9b4c74984e1fd12cf3973239fb4fc21730300e92153e407deb9979371b0. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/FR50X2287808.
Rondo alla Mambo (Inspired by the Third Movement of W. A. Mozart's Horn Concerto, K. 447)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a5c5e40dabd83b4936239aa49c2367f670b9c444825dceeb85c486994efba1. 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/FR50X2057808.
Rondo in E-Flat Major, K. 371 for Horn and Orchestra
Horn Concerto No. 2 in E-Flat Major, K. 417: I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba60f01d535311a3f87fba18160c74163f228e3a3ed129a373482e2086ebacb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR50X2287801.
Horn Concerto No. 2 in E-Flat Major, K. 417: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff6ed42edfa07bcb526c7d63918c03e5806d875792597059ee939d1686f3a4c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR50X2287802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3270fbc69e9edde866a4eae12dcb9c6553a3ca56e309ff20d65371b344113210. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR50X2287803.
Cuban Dances for Solo Horn, Strings and Percussion: No. 1, Tamarindo Scherz-son
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cf6d69a965055f3b6b74c97aec4b67e24a06881aaf505f1110e4bc22ff3291. 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/FR50X2287804.
Cuban Dances for Solo Horn, Strings and Percussion: No. 2, Danzón de la Medianoche
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f34011641d3f2032124d1e77d45927d1a3179b37198a5dd4a114a4cda98690. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR50X2287805.
Cuban Dances for Solo Horn, Strings and Percussion: No. 3, Guaguancó Sencillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75ed76c4d329190e19b6a7e9f3b4e40b4b0f72cc0d5784091555f357958b64f. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/FR50X2287806.