Miķelis Ļaksa (born 2 October 1986), known professionally as Markus Riva, is a Latvian singer. He has released several albums, including the debut album Ticu (2009). Riva worked at Capital FM as a DJ
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 0x9491ec5b58dc52cc56aedd5f7a5389dc24e2d412a0bf732ab4ca713061a28051. 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/c2847631-d72d-451c-8978-4de0d3f4b41a.json and https://artists.proofprofile.net/proofs/artist/c2847631-d72d-451c-8978-4de0d3f4b41a.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 0x2bbf714f8dd51fd2f34b7148a838f86775ea4643c67efaf0fde6795aa76c82b4. 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/LVL151805067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501457df00292a44514f54584869c17e27a7f49824e650a0619ef8666f6cb2ec. 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/TCAHD2348453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e080e658145fc3d7a9db5949854bca0767c67d4c9bb5510a339b0103294e47. 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/TCAIY2498488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5677109f3d884a2d2ddd202ca3961270e767704bd694a06f4dada420df5b42b8. 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/TCAIY2498498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263fc664ac2a01f0a4f4a75121908978418df10fba4adff2f3845a9d3cdd2f6d. 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/TCAIU2409721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cc3f60447d5847d0829cbc4de1c31faef2024df2c71e308d5b39482d5a1ed8. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCAIY2449245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4533b69c3af538c0ad5fdf0c0b81acbc218c1f7a17aa284192bac635747fc9c. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCAHS2351061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266dcb563a00255ad3191ac5ba4cad8623c44f68e5443cab6b23bddadf83f6d6. 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/TCAIY2498569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d8fc347232301aff45d44ea0e04f3403c5a390a7e2a5568fe734b43edd318a. 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/TCAIW2439090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b8634e6246fc1e24d5403988ac08c784656e58a755d5b795ebcb2c6f5142cf. 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/TCAIZ2498586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cf365ad550adad1eeb7a3cd6e7ef8c228e62ac5916fcace8ff0d1c2529c8f1. 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/TCAIU2423583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64dea9d7681e321cda87606794bd5ebfd4a2baddcbf9b09ac829190b285b657. 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/LVL152005279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854cbb8e6ac16471ed3b1d4cfb014a52986eb738b8461280b7d002de748e8633. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TCAFS2191947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf155e7e7262b66e7dac27e761b1eee1b21ca75f246990dbe793a30ffc277574d. 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/TCAFS2191950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c114f0a31872ccf9c730e0f4f81889c457c4f9950f5c4b5bc2d2b66983515fe. 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/TCAFS2191953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5032e9269030851865c4e9edea465c5908c2e7d375b4b12cf53eaf201892b466. 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/QM2PV1832663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18ffe246248c94fe23999d15d78c1b88faa28fbc90bc79f1b30a8f5fde469a8. 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/TCAJP2525246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cc3f60447d5847d0829cbc4de1c31faef2024df2c71e308d5b39482d5a1ed8. 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/TCAIY2449245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263fc664ac2a01f0a4f4a75121908978418df10fba4adff2f3845a9d3cdd2f6d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAIU2409721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263fc664ac2a01f0a4f4a75121908978418df10fba4adff2f3845a9d3cdd2f6d. 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/TCAIU2409721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657c94f842553a57536a2c97c98386e72cf5ad1fe6d7a77eba6171b10079407a. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/TCAIO2497166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa583506e7de482a99ff06e717a934c79762dea6dec30b65f2a65d98c812d41. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/PLA552400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce10b1d915e43e7a59371d4ccf113775c02b3c624167ffd11a1f5464335bfdb. 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/TCAIC2461925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e07e821ac62adcdb7ceab6e647e29fe3f3282d0a70ff4f8b046b02dbaaa0c14. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLA552400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4533b69c3af538c0ad5fdf0c0b81acbc218c1f7a17aa284192bac635747fc9c. 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/TCAHS2351061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdf023119c2f6e835bb4a573cc173a5d397fdfd4dd726da119b12d2e2310911. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/PLA552300866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1509c227fbac6ed85e0abb12646b7e951ad6750eee24276e15ea13c300859889. 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/TCAHF2382095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcdc4db3f77bbfecbdec70b5e41af96b25b7f7c59236db3e59b9e8fd29d35b4. 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/TCAGS2354383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91c0f1977957b0d26b597fc1a0cc8634d63eb5a8ad2f5e85662a88043408977. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAGB2200594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c8577e682f835ce332d93123b2e51c2d541c7373ec2db61dc8c7bdb3cc605e. 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/TCAFU2149448.