Marina Arsenijevic (born 1970) is a Serbian-born American pianist and composer who also goes by the professional name "Marina". She is known for playing on a transparent piano, recording popular album
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 0x032d66fc53bb830d0e12f0cae872d78dcad51ff267ca9b2faa8486b3f8dfe226. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3f94042-ee12-4559-a1da-e2219e888e98.json and https://artists.proofprofile.net/proofs/artist/f3f94042-ee12-4559-a1da-e2219e888e98.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 0x3489e5ac0e86f98aff4ede5459a8895121d401654477be2f671f59a20bd8c1f3. 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/AU3SE2200285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5617d50c9b026887d7c80618afc3962fc4349fa94a76ce9dfd12d2fe20cf241f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/AU3SE2100722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c25c88fabf424481c78fd508158fd5da7d10d8b873284c814f797956a9c1ea. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/AU3SE2200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e60f4b8898b0d99ff8100c64870cbd62a05b45ffbbdd086f96f4dfde115e98f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AU3SE2100723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7115f4c179a651b8d4bc0e2321695cfd176f4420562495e0c39bae3c1a2fb56. 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/AU3SE2100524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9c92a7593587b513a33692f41c18be73fff9ffe1031399213870c4874254da. 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/GBWUL2380860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51baa382761c7d066c95d406eb3f26c357920d43bdd6a1fe9b69d6902a50c4d8. 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/AU3SE2100461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a84725b91537fbed0fdfb0d1bf1120a1717b6d6345fdf7f12bb1548322f8e51. 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/QZTRX2458479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93e9c2cc3398e83f68d29d8dc0cc4e6ed3ea40c8fa053b077739e4cbc746913. 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/QZWV32344374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9c92a7593587b513a33692f41c18be73fff9ffe1031399213870c4874254da. 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/GBWUL2380860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c4c10d044b008a91adb6d227d0c43acb5c7860e04c7bd7b6a8f358012fbae5. 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/GBRKQ2329787.
Chopin Waltz Grande Valse Brillante in E-flat Major Op.18
Chopin Waltz A flat major, Op. 64, No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044cc4c062c3388b4639af76ea06aaf700e29937cb98f3ebb450e3a109909532. 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/GBRKQ2245593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e60f4b8898b0d99ff8100c64870cbd62a05b45ffbbdd086f96f4dfde115e98f. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/AU3SE2100723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5617d50c9b026887d7c80618afc3962fc4349fa94a76ce9dfd12d2fe20cf241f. 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/AU3SE2100722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7115f4c179a651b8d4bc0e2321695cfd176f4420562495e0c39bae3c1a2fb56. 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/AU3SE2100524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51baa382761c7d066c95d406eb3f26c357920d43bdd6a1fe9b69d6902a50c4d8. 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/AU3SE2100461.
Chopin: Waltz in A-Flat Major, Op. 69: No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb24df49ba0bca0b1614a385585646dd3ec19ad04d3defaf0da7a0a3ff33aaf. 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/AU3SE2100339.
Chopin: Minute Waltz in D-Flat Major, Op. 64: No.1
Chopin: Waltzes Op.64: II in C-Sharp Minor