thumb|"Kamaitachi" () from the "Gazu Hyakki Yagyō by Toriyama Sekien thumb|"Kamaitachi" () from the Kyōka Hyaku Monogatari by Masasumi Ryūkansaijin is a Japanese yōkai from the oral tradition of the
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 0xc72c4bb4b25c1d00b8f025b68f61d574b4a025ddad2daac0889854003c2b2fd8. 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/a004772d-eaea-4553-b44b-48704bbb68f5.json and https://artists.proofprofile.net/proofs/artist/a004772d-eaea-4553-b44b-48704bbb68f5.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 0xaf2eb5e42fdae29c4b50c746df61e52b106d2968af9e29d27dc738b5506f34a3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/BXK182000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8203729fd4122aaed1de2bcf674bebfd00635d5e1c8586f50ed1d4aa42a8f32c. 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/BRUM72000783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214316251490bc7d65b8471efb5c94f7aeae9f6382fdddbe87980abe4aabbd7a. 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/QZNJV2022724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d128020f1075dd433223aa7dbea4ca758828f7e9c66c6a06a39148b3e39668f. 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/QZMZ92077470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b930396e6236b689ac5cbfdb6744f42c960c3f7a96d5581f48076e98e6c88e. 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/BXPOB1900070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8aa5525e0d988d5dd61ade5f4cfec1e31ac5eaf476a026025185f17065553b2. 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/QZNJY2147927.
O Calculista - Ao Vivo Quando A Terra Era Redonda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7583a87dc799af8deb39fe16eff74511c6bc165ea8da4c16b7ab30bb1b073135. 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/BXYJ72200027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce6ec64cdf3cb08affea0956cca72051b4ec44030d9f7cd2ee639e3681f8f88. 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/BX08N2100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb4197a78f0bbebeb4577f53bbfb0f61b4dcb0cc0ed2a5553aba8c5c39c5683. 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/BX08N2000139.