Nobukazu Takemura (竹村延和 Takemura Nobukazu; born August 28, 1968, in Hirakata, Osaka) is a Japanese musician and artist. He became interested in music at a young age by listening to the radio, and bega
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 0x8475935f6f9bb782086e299fd1ae34de67875b89669d0c35728f5180ce906f0d. 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/16a25cba-1bdf-4ce3-904a-0d95df09f9f1.json and https://artists.proofprofile.net/proofs/artist/16a25cba-1bdf-4ce3-904a-0d95df09f9f1.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 0xa663192527d3010b0a463e7129ab75ebdf5d1f28bcab7bf9dc463d102a233e27. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/JPWP09707070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c43baaf3ece049a67681fd2b1f38f4a8c13c54dba390960c22172238b971ff. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/JPWP09707080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd186201d5e3c30bf38381657ae19e0ac251eafeb58e1299547e76d34977bf3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/JPWP09707090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c36a3aa0edee8484c6c08c3214ecc639b5a7a3cb20455d6b3e851b6896b758. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/JPWP09707110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52feb6b39e5bca92ed5cf0ce80a458f3c39e1fcd2603893706b94718c12ba2a0. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USTJ20306802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b27b76bf60497e563812ab3629149e4506c937c6a3c69954b5ce6c7d02e2fb5. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/USTJ20309402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15d0b96b4cc223ea419c85dfac7c83133e76d6849265a04e7933713d236d0e3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USTJ20309409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdec7ac34ade964adc27ae26e84b5a5f8c23746a4f3c86c847cbb16203091893. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USA4S0300175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa05072d8eb93a56548d1c6cdb3c72c2b5476b367adce054959fc669728f86e1. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USA4S0300179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9160fe94dd3094eb74fcfd3d7efaed86f4502196c0cbb0cb01046cfb9783cad. 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/USA4S0300183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f447c241c241d8ba6261563d1cef12705a5169ef094bff0559d443031d59040. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/USA4S0300190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d5f0ebe7584c44ec8e25d7ab1e6df2eeea7fc747ef93eb5ba59478b3df89d6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USTJ20311802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c33e08c8416b3368d587f147c0dc9ea03ca6f0d73f4f19097cf58f114d58d86. 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/USTJ20311804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595a19a12b7e8a25ac8cd78ed49127b77a9430f721f569eef03fc48325d9fe7c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USTJ20311807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda834fc7c8c2b218b855cef10870d1a51c0b78e20e4f2afc0cba60baa5f48041. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USTJ22563910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a44c76c88973dfa72adc3a1905dcdecf90023fe6acd73a5f0878ce74439b8e0. 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/USTJ22563917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974e3e2f37c5eec78976593a9be76e7cbd91966633d3bee9e804ed65f157c662. 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/JPB600319505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025bf18dc7e2569f901444b68b8ed6a1c9028714362740b4fa83816219c1ef36. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/JPTO09817980.