Roza Kostandyan (; born 28 November 2000), known professionally as Rosa Linn (), is an Armenian singer-songwriter. She started her career getting signed by Nvak Collective and releasing her debut sing
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 0x4300d4ec6d2ef6db627c3268f6047ba45d9e6cde2d57f9ed825aa1766afa2e42. 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/ba1e6a86-a8ef-454d-b50d-19e3eaa1590d.json and https://artists.proofprofile.net/proofs/artist/ba1e6a86-a8ef-454d-b50d-19e3eaa1590d.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 0x41a428d26ad00f045543c3bd9667a57dc427cf26b9f5b5712221fc64b0443aae. 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/USSM12207342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3538030ca0ee008ee8f7027d1cb840e1cf07dd1473e9283d58fafd0b8020a32d. 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/USSM12207368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4009527a0dca0b397f31c6566c6eb46752884a3dc10fac43d0ed46373b935564. 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/USSM12207369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406d2dcb5a1985a280c7a8e7f95741d59b7ee8588cc9fe6535472b5ac7ca6f60. 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/USSM12207370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5eb67538336ce07e236b11aa32846abbb33b1929934cb03b2b7ad9a635f4a1b. 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/USSM12207371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd56890fa9ef78b48f31e5515eda54170ae548bd575f76b31c82f3807f1cf80. 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/QMFME2183287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b276b5ce74e041504a591be7b54180ff68f417d5fc7c33f5dcc1169160fb3d2. 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/USAT22402565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4009527a0dca0b397f31c6566c6eb46752884a3dc10fac43d0ed46373b935564. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSM12207369.
Snap - Eurovision 2022 - Armenia / Karaoke Version
Eurovision Song Contest Turin 2022 (Karaoke Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4e1d0e6669ad2eeb56461c3f549d37d48bd2a7f37f66e0d1dca19f44a91574. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DK2DY2200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b276b5ce74e041504a591be7b54180ff68f417d5fc7c33f5dcc1169160fb3d2. 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/USAT22402565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a19acac3c96ce70b4fdd817e845e86c829681ec34e794a188a1d6b89be37ad. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM4TX2492438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c059bba67edb0c96a0ee9f880b820d97e9993b5c3be3b2e6bba984195517c46. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM4TW2435764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fea9f457563e5ddea79381f24497000d199a85ba1234c35aad6b5438a61dbf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM4TW2493885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b276b5ce74e041504a591be7b54180ff68f417d5fc7c33f5dcc1169160fb3d2. 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/USAT22402565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b5830e8aa00044af417d8f4ceb4f21f44922300c9dfa440f621031d5b9837d. 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/USAT22405696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b276b5ce74e041504a591be7b54180ff68f417d5fc7c33f5dcc1169160fb3d2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USAT22402565.