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 0x6694939e2d397eb40021f32f2463052c4a0d5bdc56113419eaef976b13200f14. 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/c904af79-0026-4e72-b625-6d69f5909050.json and https://artists.proofprofile.net/proofs/artist/c904af79-0026-4e72-b625-6d69f5909050.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
こどものうた☆ザ・ベスト～とっておきの50のビタミン・ソング～
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 0xf39bc403711550328d9865e2767b52e221172812936a28e1fcba3036b4a2b5e4. 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/JPCR00606280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b01d996ea1184c2a6e6ee3b6bed03d68428b16d825ad5083ce2db8c7d7f2b7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/JPCR00708650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685e41fc6b434f5a376a90b8ab4bf5f8ba8b103dffb4ea3261a4b066b9ba4d98. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/JPCR00505280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e1707d2db0f90e7b361dbb9bfc03b70bf2b763e0697ef490ad8b0b93ead76f. 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/JPCR00804510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6dcd87412352907627e7baeecb516867ab86144401adbb1e96f5a43ba3753b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/JPCR09805250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04168c14dcccec8d96e1ae8e5cc0ccea345a72ceca807723001283089a42b80. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/JPCR09701310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a887b884671ec642c52c34136c42dd53774f174094c30de1629c0154563d1f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/JPCR00000290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c7d301ae0454ff65206b0458d935e17db33e841c26408867bd5b7ea0050ed8. 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/JPCR09805260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d272873c16394b8bda07630f7c1074961f17919724d8f0d62670cb3bd01dca. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/JPCR09812730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f49fb8f04b7b87b26649e9784ef2353d9a50bd6433a496d6e9937b8422a6079. 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/JPCR00203710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa27622d94b840228108c14bd6a0b8e13887b50feffe7ba4999b1be546bb9f9cf. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/JPCR01104520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2277bba455330fd63bb03f4666738c0ffda625e09e89677542fb269807e05e. 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/JPCR09805150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf634a3420adf11cd0abf09fcfc98a828a5a77e9e5ad9db3ac22998431bc4366. 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/JPCR00908540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143fbe534e31f698a5242002fc4a5bd56ecd55121b235797d19b859876281e08. 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/JPCR01201930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276ecd7586b2a233f78ea3c4dc9b16d9344610abf2a1bd48c4f7af6314b343ea. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/JPCR09805300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52443e17615f15cfe9e5aac5f7e4aaff1757c1c08a935dfa72b6af2843e19726. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/JPCR00111170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc047fcf081571d0e48a83d9ffb96596e121cd727a6c8af97a4b52380e9fcaa2. 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/JPCR01105970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d829392f2bb655a42e8017cbaff31ab98a93dbf7e6a34f63662b11a7ebfff51. 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/JPCR09812750.
101のこどものうた～ずっと聴きたい、もっと歌いたい～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a60b41123529e7ac2d38af7edf0a873ef6286c6066774102ede2fb3b3029b23. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/JPCR09701530.