was a coming after Keichō and before Kan'ei. This period spanned the years from July 1615 to February 1624.Nussbaum, Louis-Frédéric. (2005). "Genna" in Japan encyclopedia, p. 239; n.b., Louis-Fréd
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 0xd5d4d357f83c4014355e235f2f9bb2318ec0ced9983d4cb49b1fe198c16da7fb. 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/7fe3a7ff-1682-45c2-bc65-d099a0cf4fcb.json and https://artists.proofprofile.net/proofs/artist/7fe3a7ff-1682-45c2-bc65-d099a0cf4fcb.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 0x1281c7efdf0b0351dfa4251ce12094edf1a46fa21a5cca958373d5279694e0d8. 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/QZK6N2251345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454364c503aa59466883932536a2dbc194dd6b23495a6e9471bff083f2a341b7. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZRP52290732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a4508d96256f108dc501f82da3d5fa944cfd4245b0cbebaca06467db9b2840. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB42272619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9452522473936bde1d4817d54783c7c5a75caab5d2680b2f3b5a81d1e7bb0c7. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/NL5HJ2300344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b663b371e118edf8b85292a5bf6ecb8dd6128b21b288efec67c00ad2370968. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL5HJ2300359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b227ef0c31e1020a18652b030347c85029238ccaa7680a7bd455fe35e8655b. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/NL5HJ2400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbfc6f6d63cd8b1873dfe89f01cc5abbbbb185c4e6089f08504b85e0f3a6a7b8. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NL5HJ2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa435268beb896dc090a2d7728e61b8f276edef9dd8cfb643c84d0d79054afde7. 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/NL5HJ2400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce19cfc9cc489148891528d4fa21c5c588f79fdc90f7f6c2472a0985ea934f1f. 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/NL5HJ2400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83c786c944bbf1817da21a804255fa9eee832bd159eca4f1ab3129e8bf248d7. 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/GBMA22467321.