Tana may refer to: Places Africa Lake Tana, a lake in Ethiopia (and a source of the Nile River) Tana Qirqos, an island in the eastern part of Lake Tana in Ethiopia, near the mouth of the Gumara Ri
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 0xafd2cc06be0553576158047a770ff5ddebbbd89fcf7613c1d4a750eb31371613. 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/7c217c8f-99ec-42f5-90f9-40d124506cd1.json and https://artists.proofprofile.net/proofs/artist/7c217c8f-99ec-42f5-90f9-40d124506cd1.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 0x27bacc5c60b04abfdeddf30527686464cfdc9cc24ec405605260040fa609b485. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/UKNGT1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9972b7b466abfaabc05978de6da539fb62e8228406260744fe3e300dccea8143. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GBMA22029958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a97f2e5e95d6f2040fa83c1f098d5f37a970f0375c3ac3f0cfd5c94c35159b2. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/GBMA22069276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a97f2e5e95d6f2040fa83c1f098d5f37a970f0375c3ac3f0cfd5c94c35159b2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBMA22069276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3025524d48cb36331e4eb5b014f5764c5ce1f54a332ce4738d91d2ad198a4e25. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/GBUM72002793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d63309d353b8833281244089762733bf73a9b32312f87d259d97098baa3e508. 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/GBUM72002792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160b1cf1c9bc2f8cebffd7069be61b07e78fcc16177f3382a6d315ba397a5602. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBUV72002401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca79d498805abb9fc3d08d370f399344df4e96d55a3f392f6599dc54f0097cf. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QM4TW2250570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623192603417b383bd54003a2db3b132fb47bf9ca26722e609a4e3985a78264f. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:45:59Z), 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/GXF9Q2534438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f03cf8d4fbcf21c4c6e5ea77015f6d8354126e26db520b3cd35b87e26b6c52e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GX3Q92598376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e3e7ddd68c373889b2a1a337fb0abd66716d24df3ddb36eceb98e0513739ad. 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/GBMA21863258.