was a after Gangyō and before Kanpyō. This period spanned the years from February 885 through April 889.Nussbaum, Louis-Frédéric. (2005). "Ninna" in ; n.b., Louis-Frédéric is pseudonym of Louis-Fré
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 0x22196a0c35603ef7c05ef2774d557a79e2cdb42ed9362b94fef1cc64fe7cbc26. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7e41e10-efe8-4bff-99ca-21034f589313.json and https://artists.proofprofile.net/proofs/artist/a7e41e10-efe8-4bff-99ca-21034f589313.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 0xd57e420e0aaf53cf5003ebd4a8e374102d423a0e5bf34ce4b2c4d747b6d69edb. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/DGA062273215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c576971ba21c1cfdf711722598b19a592133c7cb9abbf3805bce5273952ce28. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/FR9W12432944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbeac8517a29c168fb38be68e2ebe03e64b1e008024e682e58494c76974e6f0. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR9W12432945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f3603a6e41f7b2e082c222257e25e7d38600a5a70a9f1d1a70b4a8d302bc36. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FR9W12432948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1526d0e39d68a4769864fe0e9b48e114e30133f08e6d429980fc7e2f487ee115. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/FR9W12432940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8522290ed83d4889c7fa14179ac347097bcfc1af0c5093e78efd073d6ac1c8a2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR9W12432941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cbc21e3a548c72b6c9b74c04ef8b56968fa08e4027327305810791a6947033. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FR9W12432949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54e61f3d0c6987b1ad4dfcb0b599e23a05372fb8361672cae14d9dceec4c213. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR9W12432942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830d438d2f77620438d50853fcd26960fd0d1606bd8e9fee376cc7833253a1f1. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR9W12432943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06144873a723af807a777f77c1a83bb4a7a8d74c8dfc3b5e61b8f78806ed4eff. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR9W12432946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f6ee1ce8c040ef8e7aded93e4e7905e987aaca1ae9b65aaf82ecee9da76a81. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/FR9W12432947.