Valka (; ; ) is a town and the centre of Valka Municipality in the Vidzeme region of Latvia, on the border with Estonia along both banks of the river Pedele. Valka and the Estonian town Valga are twi
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 0x968488e381c0d15c3b725480b79c0be025118dea22c0eeff0133b6b9524b0c06. 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/f9bc6647-3d64-4ab3-ae1f-36d6f233eaca.json and https://artists.proofprofile.net/proofs/artist/f9bc6647-3d64-4ab3-ae1f-36d6f233eaca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Buenos Aires (Obvio) [La Ruta Del Perreo]
Buenos Aires (Obvio) - La Ruta Del Perreo
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 0x2beb6c9f28ce07fa8607c34d0bb3d3fe239d55a6e6da742a5f710f57d4405305. 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/QZZ662359950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95094714ab9f35dced2198594f9db5177eb92c24913148d58d1613fbce339862. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USDXS2200564.
Amores (Madaë Extended Remix) [feat. Valka]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad031b3bf8803f71b37d1f7ec77bb48e3ece4b25609b1c9458f54afdd9bdced3. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USDXS2200565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2beb6c9f28ce07fa8607c34d0bb3d3fe239d55a6e6da742a5f710f57d4405305. 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/QZZ662359950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7ce36da18b1be94d284963ff7bcc209e6708d0c8f385c77768c5ddf4e8ba5a. 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/USDXS2100591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45db24fc5134fef26f895dc30e990f2c4b194612ec9c5794072caca6f95332b8. 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/QZFZ22013961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f13e317398059914393037bd69b07079e6577a39f512a75a6e0bbf6b9ce2ea. 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/QM7282430423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7793b006262febfd5833e3fb4a63b6841f4e4925034318451e79380ce4b6b03e. 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/QM7282432995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf82ff0d531ba049dff5bb3b92db5d3f0e4762e5ff1d2e6bcfa2aeecc2ea5a7. 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/ARIXB2401898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef01a74065bd3e182ebd0d590fa70626187fc2126d4d0d8ca53505cd5f9c9c52. 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/QMDA62491852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e81f172070dcfe5b8bfde3fe127d001b0610590d9a7f1f92b27603f5824e1d. 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/CA5KR0024553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aac371d9aa7e4c23bd39204a5abafcb07121879e928f6c9e234102682a22598. 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/ESA011641391.