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 0x79b752d75ff2329e97ddb483d0cba81edc51f4ec12ed96845a1ac2559277d0bd. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b563b97-26f3-4e9f-a397-c0f52f1b07fc.json and https://artists.proofprofile.net/proofs/artist/5b563b97-26f3-4e9f-a397-c0f52f1b07fc.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 0xbaeecbe866f6f0d488aaab8049c2b6650940dece8b547c031809dcd558d87468. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QT3EY2432610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda819e3726a2982d12b2a31f5a293d111fd5f9c2d54582a4f9c16cf2ecf51213. 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/QT3EY2432613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352c384e9968f3553f17da81ac115ef59d52e3597d4520ddfc43010fa04b1253. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QT3EY2432616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f56663c04e79d951bf31aa89ea010debc48c0851b3b7599f604626223df449. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QT3EY2432621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2253147cbdf52561a8eb2191d0490c63c8c5cc0fa18c3e993b793af838838342. 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/QT3EY2432622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2537cdf2fb4d3cb2a0d8baf4d86483072980bdfb5d9734f93d0d2a766321fe5. 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/TCJPX2333937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3a8e9ee963bab2488094941b13a475e1943f7319b10a68d598cdc6d596e508. 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/TCJPK2060801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1f2d65602eef242c3ace3266d497de3be4b2bf7fdd6054c5711cde75b5eaac. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/JPS801852948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047dbe69681f8b1de2cb1b34739d2fe8d10cb95cbb783e31bf5a323c97c7ca59. 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/JPS801838562.
いたばし夏のハードコア花火大会
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x022b454faae0ad9c378c7ac19ce5e48c5b5ce4205476d241575df41f2e922431. 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/JPS809919693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d75a77df5316ecf69fef805762e9319eda35a115ea049a18fca256e9d837dab. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/JPS801850567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a784ac5b4e9b6ac2be05d09476441580e6d9e706b6d1c2ce36752d16906474c. 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/GBKQU1624886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b4b648a17b61277284d9f63a69a07c7accf52b5638cdad5c02213ade2aa76d. 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/JPS809911675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa887c096417bc7bf8e2126e097052b71a80cc663d7132020e12ebe73a5de6a. 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/JPS809908853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d45be24ee11a67297d9976ff7e22bd50696989b88b48ff600ddb283eda75b3b. 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/JPS801403405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327381176d82a42ae284d500e8ed07d1d6bb2b7a9113db82ac4b5ee3dbfbf413. 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/JPS809913479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4f5b7311fc5b3fbc962899438a7e8591a34d11850501da724f9e7c523315d8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/JPS801960722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee15baba580fb2fa39892b9353e0c24ab1b2dc252510201cd90f7ad77c92b064. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/JPS809912131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e4e825f89d14fdcecfd95bc53d4c4ee0832cdd6e5e8b4200909600bc53cf8a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCJPA2421309.