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 0x7ea78f4bc8450f523a9845f8ed35de635a4f8d63577ef8e316d4f53e3505026d. 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/40bb63b3-f0f8-4ad4-b5d5-c3bd70892d6d.json and https://artists.proofprofile.net/proofs/artist/40bb63b3-f0f8-4ad4-b5d5-c3bd70892d6d.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 0xe610b730f0ebb2da176e030008628779263d2c85b1d5ca93081ad3dfedeb3485. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZHPJ1907099.
Don't disappear, fireworks (feat. Sanso Nakamura)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe952720e3118e6d4936f6682e8bec3bd7e5d9906d182e586478573920cc089a3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCJPL2033567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130bd2dc5df14668bee7626dd1aa56f6ce4ab66fda0beaeb15db80c5b48c36d8. 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/TCJPO2106392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ce4b951d0db5230af937018ea0e84dd9a6ab0d56d32d7ce7dea882f9f7caa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCJPO2106396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ba34d958454b722e1b52ea10a2490f913d756e1cc23f024b17eb543f190d85. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TCJPO2106403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1340de5189f5942cc315d8cf7877ea64fd22bb6670eca473c786a5a1ff7f09f7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPO2106410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fbc2598e1f50938ecf8ae220a3d00e81b8ade780f701238e4266cdaca76573. 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/TCJPO2106419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ce4b951d0db5230af937018ea0e84dd9a6ab0d56d32d7ce7dea882f9f7caa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPO2106396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fbc2598e1f50938ecf8ae220a3d00e81b8ade780f701238e4266cdaca76573. 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/TCJPO2106419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b30f9f869c31df1655be47098aad3431c08ea12a6bd50e47bd21f37a167143. 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/TCJPQ2174084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c443981b65e6179501a71ded669785684a2398734119a524b856509f6c8b54. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCJPQ2294097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c443981b65e6179501a71ded669785684a2398734119a524b856509f6c8b54. 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/TCJPQ2294097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc6d4aac4e7da7e6fde0cef677e0cee8804e3ec7bf312aea6b3b9977b116872. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCJPR2222896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc6d4aac4e7da7e6fde0cef677e0cee8804e3ec7bf312aea6b3b9977b116872. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCJPR2222896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b5772582d1f7114c7e84f33afffe4a4bc151d8d56c233885100a0d434721cc. 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/TCJPT2231200.
コーヒーシュガーとメランコリー (feat. 中村さんそ)
Coffee Sugar And Melancholy (feat. Sanso Nakamura)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa385f65708494059db39c2bde6fcca6b01ca314102c9224040b55ca7101d7535. 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/TCJPW2368557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd579128cdc1fb3cf3fc847730000e6668e0b9e8596aa976650d9697f7f9bde1f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCJPY2322976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117d562a3f3ef74ae5ab324b91ef8de9cca92c1d718a96bc3bd340367a90e4d5. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCJPA2468837.
Looking for cosmic (feat. Sanso Nakamura)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117d562a3f3ef74ae5ab324b91ef8de9cca92c1d718a96bc3bd340367a90e4d5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCJPA2468837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dd0bae75de2852d3b75fa593deb54293257261bc7929ca0628b806d4d0d09b. 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/TCJPF2549450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1463973a2df9ebf6dd48c77423f67d4a09a0734113080740f602510e0cd8998. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCJPV2390138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a82bcc905ec8786373d35448eb7d4f5e097cc7ced60fd43fc49c15aec1a7fa3. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCJPT2232972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31acf8ed0f99ec36d25f6d1bd7f4cd4c75547733ee67e3b63c7800b7700ab45. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCJPT2232976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5e0ef12744a61b59b6563e518b919e3db224cff566ff25f1eba95d762a78c5. 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/TCJPR2264226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e736682aeed6db0bd8b4752af03dfc87e1326232065d9d06bf886768405cf0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCJPI1994805.