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 0x8db832c63c71a811dc0505d4ad63f1dbfa7811ecd6d2894dab8e9f31bf4ff020. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4fabc64-3b30-4fae-aa5f-69088eac291c.json and https://artists.proofprofile.net/proofs/artist/d4fabc64-3b30-4fae-aa5f-69088eac291c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Enjoy English!With Eric&Kids ～9歳からじゃおそい!音楽であそぼう!えいごのうた～
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 0xc0c0db4082a68450609224e9c2248f12108b53ae0e062e8f8fab0add946904dc. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/JPKI01716209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a1fb06ea04b472a0fa55486a2acbe7a1cde31fa050ed2eacb1f36968acbe96. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/JPKI01716210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba17bcc6abfe7fe016561fcd0523a806f153171ff3285c6ce46ecc43a0d2d5fe. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/JPKI01716212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfdac852376fe48d38c79b6266655ea4cc40da8f50dc446690b36a12d2522ed. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPKI01716213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4a65599cf23d8c853ac5610e9843ad6d45b602fdc0895a88da06d906a8797b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/JPKI01716215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7c0335ab8e220256b210f6152437795c5c3034ea6f2c2e8b00be625f6236e2. 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/JPKI01716216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f26e1d54d85d84d2e726c2c3d8129f08764b221370f28b17639ede77c4b096. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/JPKI01716217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc935b560e1f6e3f71e0afd9431068bb446391612a8e5fc18d53f6e4160fa8534. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/JPKI01716219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b97126fc58a441193d4af067da50ae5a2957974fb775febdfc7c0a3d03b2b4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPKI01716329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62199b5b9a281555dd28df2a8e8639a3482acaa2de64b3086c870b6acefa04b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPKI01716331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473138a356c6810d7fae3fe7243f35b62a15710a8bfdbb37f4305ef2e18d931f. 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/JPKI01716332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc54732044e64aa6e0fb92c5b8404af4038e39abbe6f8c24ee4905326d04d5a. 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/JPKI01716333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e52cd23d02989c994b924add775222b9f01d236498c2a9232fab5af0cf76e8d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/JPKI01716334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0fd9a94146494da30155c3edb7db234e760cd8c541cd1772f170b6de477181. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/JPKI01716335.
Sing In English! With Eric&Kids ～9歳からじゃおそい!音楽であそぼう!えいごのうた～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01844eba61708f42d6f46381f710faf980748c8a31710027fbb9f7eee1eafb57. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/JPKI01720239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84302ef37673edcef7055212de4607946255de395b2c2d405b2bb3c0f24fa01f. 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/JPKI01720240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4879f6ccbd17b24b980187b312b96c992bb1fe6fff3bd40ef859b4f7782a583a. 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/JPKI01720242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f3f0c291de1bf22a38170ced71d66500ce070077de1cbab67a42adbedb3e70. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/JPKI01720243.
If You're Happy And You Know It(しあわせならてをたたこう)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54b8411ccedc816bf8b30fe2c497358c4c283e239466fbb847f7f852ecf7d5a. 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/JPKI01720245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4f4b6c21b913e12bab7598a8d4fedf45c455ac045e049731331969ed4d6c38. 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/JPKI01720254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb56b963fa958180713f55f6b26c7388f8d2e56d6ac48a1c0fcdb2e9e7bdeaf8. 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/JPKI01720255.
素読み&歌 流し聞きで覚えられる!九九&英語ほか
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589eb287e9b3ad1459cb1476e8e45c1407d9ddc7c3e00a9fcfd75cad3dedb035. 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/JPKI01716208.