Paul Constantinescu (; 30 June 1909, Ploiești – 20 December 1963) was a Romanian composer. Two of his main influences are Romanian folk music and Byzantine chant, both of which he used in his teaching
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 0x9f3093de47a2135834c3eb5be371f3dd15fda11d2d8bb379115e73fbd3610735. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e6e9d8d-4d8b-4b80-8e19-dfba10c8a3b9.json and https://artists.proofprofile.net/proofs/artist/8e6e9d8d-4d8b-4b80-8e19-dfba10c8a3b9.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 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 0xf12439901001cb6560100a3e896916bbb6782a99d24a33b19c9ee10710617860. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ROCRP1303513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6716e9245ffec97d0da7ba3b79dd2ca236f70af07c37af69ef77743783c281a1. 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/ROCRP1303517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfb692292d7d016223ca1a63b80254779e3a6e2969bb42a4900d836c69c6865. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/ROCRP1303521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33403640839892af5ae2246d760f9ba375b46d40ef5d233d91452a4d8604c171. 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/ROCRP1303528.
Constantinescu: Piano Concerto & Wedding in the Carpathians
Constantinescu: Concerto pour piano et orchestre (Mono Version)
Tango - Original Motion Picture Soundtrack
Tango del Atardecer - Tango Film Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4699a4d2a8309a5af1144671ab3c8457ada4d0dc5f974e32afcd49fb047df5. 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/DEF059704140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c1403cee96558e18da23f08eab802d07d194bcacd2bfc712fa6600e530c9ef. 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/DEF059704150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbcb62ea387fdfec9b11f89a23606b1e8933c4b036a130fd1b5db1661aed001. 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/DEF059704160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a813f22dad677374adea08994c7842eeea994d13d057eeb3acf44ae9e5bfdd. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/DEF059704170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5501275fd8c234337c84b17023b12562eb708645e1c521cac9c898a6f4521f. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/DEF059704180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634565c14083019001de24a464ba5e68858bb04051cae41e6aa0f19c250c5d73. 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/DEF059704190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d409611385fed64b0b173f45df4d0cbabd3450192c5e7f0398a1d62b822330. 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/DEF059704200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0e8db6505c2c49f6e0ca45b1b933654530b63b0728f6819789f11743449df2. 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/DEF059704210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42349987aabeb45ab1b5951704ccc3511f6aeaaca3a3c0f5b7aeebc0f27c3355. 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/DEF059704220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d3727a85b81d1644597effed5771ccf03ee785f784f2972d2ef46c4ca97d20. 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/DEF059704230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc25f6b55b98870554949e1f19eb306a5c97649c80c0d82423ab3dcc1b799b6. 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/DEF059704240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b477275a5fd274acbf57d03bfac5b1169c100bcc1adda521a955800744704d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEF059704250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d93545f6517f5aaae4fa7121d19e8dbb4011ee0b8736bf0362787d9a4e8860. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DEF059704260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a74a6b779f1e5d226d9d00b4f075c2fd077d85bf6427e4914e15dbbe3e72fb. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEF059704270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb520a3ca88bd6086d4f6baba98f94c5d98633e9c234813bc5036e4e79e0670. 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/DEF059704280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe869636671badcc452feae6b0d03c6ea4ce01e3fe3b10246cba7e8d0b15f0b0e. 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/DEF059704290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9957d6fd806ed74a67256b2b14cb318e0c60108dfce8931f6402a68b1d3a3082. 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/DEF059704300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8646b9d3ddabaacd12b1c294d679928c043df011538ec69e6ba6301f363453. 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/DEF059704310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb806dbe3f8cbc21ccb519e29d5cc011b33f017d570643c8daf27f0c8ab0adfdc. 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/DEF059704320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b235e74d2b61468891569221554ebd2f4d58ec4ba8779b04c7e5adadab5003. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEF059704330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442b10797e25c58e7a17037f26ac90226a0eb613cac979a7cec1a6a37721079c. 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/DEF059704340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e17a86528893d9e279d2e17084c9214dacd24376c26a0286527ea67492da553. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DEF059704350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85630c32e4bdbe6cd478ad2b8bbdf9f5f8c8fa10abf2525fa91b5d8374bf4936. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR3Z52000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e57da396d2469ea14b15c049b637247d0215e2b04fd4794f67a1d4d8965f01. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLA509511401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb280c1cafc41783cb8e2ed946297dac11a9d7234b4feaddf9bbdc6b95f4eab. 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/NLA509511413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c26b9a84a5ed2a1aec2b535508e8f66c15c704d5f1abd7c62912193df94267. 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/NLA509511419.
Enescu, Constantinescu, Schubert & Bartók: Romanian Rhapsody
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4279ec7b84a61db9a7908b05ecf477a8afffbcc4772c3243a33ce2e6c7bd4da5. 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/DES380020082.
Three Piano Pieces, D 946: I. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1993efd52c467f876b4be04ee445be59a739012a1f7c933c934ca2799dca99a. 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/DES380020086.
Romanian Evergreen Music & More (Teachers, Students and Alumni of the National University of Music Bucharest)
Raluca Stirbat plays Enescu, Silvestri, Constantinescu, Rachmaninoff/Kreisler
Romanian Piano Music of the Past and Present
Following the River: Music Along the Danube