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
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
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 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/TCAHD2348453.
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 0x53d8fc347232301aff45d44ea0e04f3403c5a390a7e2a5568fe734b43edd318a. 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/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 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/LVL152005279.
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 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/TCAFS2191953.
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 0x53d8fc347232301aff45d44ea0e04f3403c5a390a7e2a5568fe734b43edd318a. 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/TCAIW2439090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcdc4db3f77bbfecbdec70b5e41af96b25b7f7c59236db3e59b9e8fd29d35b4. 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/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 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/TCAFU2149448.