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 0x72667b6eae1ea770df3a4bb13f99c22c6d98558a10c4260a6cb92dd3c3f520ae. 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/88c87453-74fd-4916-9510-4bc282420b34.json and https://artists.proofprofile.net/proofs/artist/88c87453-74fd-4916-9510-4bc282420b34.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 0xf2bdc51cdf5abf44a4488b3b1f794b95f52006aa84f7467a7cfc15a8c764c755. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/NLE870706307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f80869366d4438532e2c3a08829f5c7cbd2647a220639bccf742f8acbf6ddf. 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/NLE870706303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda7e5c9a79adb74d6574a1db6205380e8859801b7d3eec970bb5b19a023d4495. 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/NLE870706308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60ccc81a49327bab9b8056431a2c459a014d7b9b95c91eef51dedfc6f43a346. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/NLE870706312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf195bb60212677c4f7b31bdc741e39f28666dba574d04be39133e63bd4eb2567. 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/NLE870706304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358ba33d83a950fe359dbf69ed13e3e5e0bd036e6eca087acbbd8667ec362066. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NLE870919207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6225065918c24628dbeb977793f7a19bb06589cb98b41b0337c83c08a13f8cbb. 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/NLE870919206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e6bd835c06594da1ec6030b03937e7d7f76ea2d3470ed23d2cede5b55ee380. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLE870916901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2788028c85d3b76a28dc4b63f49d93dd57fb8248f130e561988d0e3c3b3c4943. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/NLE870919205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5ee9107f2baf88e4d5e9b5e117d656484478d89bde85ffd6a7c7650b636594. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NLE870919202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe64486757daebfca6d0a032710504b59f4408e9f8f4d465232867ed7fd7b77. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLXN61500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8627c7508c2855860c3c52ebb160660530f723c4efd9442d111c10b1e7d39fc. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/NLXN61700096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217ae3dc6506793cbf8939ce71b8a71abf50e8e01c1103202e10b3878365fc26. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLXN62200055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7737689b5b05c2468525848f3ba27ce6c7ef015a6fd57e4df386c47c037df5. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/NLXN62400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2749b13507b0fb41548c0539044a550c6404b21a39fd03facc73f6f9e878dcb5. 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/NLE870914701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b082aef9e501534ee752a8f91658be36b29991ca60b3a8b220c8e2baf9847b. 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/NLE870706309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454c1f6ef7d8ee9493d3034ddec30c0f7d6fada256b7717cdd1929d5bc34fa9d. 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/NLXN62000048.