A piano is a keyboard instrument that produces sound when its keys are depressed, activating an action mechanism where hammers strike strings. Modern pianos have a row of 88 black and white keys—with
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 0xa5f78911811231afd21562d4398c8e0b6697751c090be131ca5ca08427e6123c. 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/8c2cc8e9-7edd-4c79-8ac3-393d0a9d8b27.json and https://artists.proofprofile.net/proofs/artist/8c2cc8e9-7edd-4c79-8ac3-393d0a9d8b27.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007813303bc4c1aec40d71be68b94e3cbd4a9e02af0c06651f6d854ee8f246fa. 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/ESA012436998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd2b81d7c2ff00ed5a118f960ef433ef455c094fc81cb47f8c7b59c05a323a0. 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/ESA012436984.
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 0x8f06b50304844608b005d7328a711a9a8ebecbae8cb574df4a40500458f43876. 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/GBPS85460992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf8af7fadd4e0833f5d36029eaa5593513c83732b17289a33760270d717a287. 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/GBPS85460704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7018f924ea80f0d48d5bf958acc57cfa02be484979cb823eb69670b510b09ca. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBPS85461015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc298916e468857da7115c1e44b9ee2298219fe3b64513118ccf50d2a38fd8cd7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBPS85461043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0305d760f0ed0a46068675c67f809f8a8ad60239dc56276f7b580bdd91171f. 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/GBPS85964859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabbe10f955b27c3cad2608f5918bed0b369c904fbfc683d710ac7eec8e57d11. 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/GBPS85964852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57dabf8b0df4a0ad1b12ee668eb19beca016595cd0df858e2108937eeb8bd72. 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/GBPS85964819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c64f293363ffe06db68b221cb16d7805a35ebc27450266aaa1191e166f953fe. 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/GBPS85460686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8a1a10d618c748ec07f3b8efb842c8d176961c7e984e0f9cf608439834c99e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBPS85461021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6f30df4e8cdb71d6132443ebe7749d093047ada1b4955566069c2dab6032df. 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/GBPS85460684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acaf3df53cf6e9a3da8b1a117dfde3c1455718385c128fb7c59bca214868433. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBPS85460681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1da83b0fc6cc872faaa66565c15437758db7aea2065cfe08e7f68f3846eec55. 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/QZZ972356155.
Relaxation: Tranquil Night with Calming Piano Music Vol. 1
Piano Smooth Jazz: Restaurant Week 2022, Romantic Jazz Background, Sensual Piano, Lovers Night
Zen Meditation Music: Reiki Meditation Music for Mindfulness, Yoga, Relaxation & Good Sleep
Bagatelle No. 25 in A Minor Op. 33 "Für Elise"
Top 200 Classics – the Very Best of Classical Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573c2ab76b0086ca0b8089d2225a188dfdec420bd102420d8d1f3e61e942a27e. 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/US4R31015985.
Peer Gynt Suite No. 1 Op. 46: Morning Mood
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a560b171a0f1af22c2201a5076fdfbaff38569d648dad9f55919dba569977d. 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/US4R30511121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbfcb0670e37dec89f2b3887e9cb8b4692136de992a6dbce4f4fd57d7de98d8. 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/US4R30600403.
Sonata For Piano No. 14 In C Sharp Minor Op.27/2 "Moonlight Sonata": Adagio Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6e104d35355695d9bca8d7f2708dc79208e50f56482470494adc95fe3cd1d4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US4R30601352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa031c277a1c7b053a5ca46a35f837b800f4c4c5c27da0e7a61cecb43380b345a. 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/US4R31015974.
Hungarian Rhapsody No. 2 in C sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d183d292914ddd804198c0038987ac060aefbe75f3f064aec5a45050cbe39c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US4R30908351.
Peer Gynt Suite No. 1 Op. 46: In the Hall of the Mountain King
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f6f94c4df85ed5a4cac1a182abe108e9df5739ee18e8fcd22edd491d5abb7f. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US4R30511116.