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 0x09d2c7d138c9d4b94cb0965c60974577d5b67c08f5e134c6310412eb33386779. 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/b92dcf84-28d8-4bbc-9412-f49dbf39bc7e.json and https://artists.proofprofile.net/proofs/artist/b92dcf84-28d8-4bbc-9412-f49dbf39bc7e.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 0xe859820abeee003287fe9c9fe17ee537a7c07937ca1e75f4145818d87d9c697a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FIVDC8900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33212dbf7a66d219f2af0e35144a05450b00f5c984ad2b8e78cb9e3b0a0706ed. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FIVDC8900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde23ca69cb3a04d0d098b59c320929193b46e278c2d82ba256ada46490ae0626. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FIVDC8900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0d22c7175549220769e08b405945e0020625bb8392d9b7b738e6fb45be19c5. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), 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/FIVLM0400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1610c6420cd9798b3c4585e15aae40e97e65bc0c60e5e8b42428949dc26d89. 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/FIPT61100404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb1ede9de433d565dec718aa0d29262104dc53baab1bcd8065e5cb7f6b1db4. 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/FIPT61100406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22e67a15b96e1c877f60528928c82695c50ef305d144e77454b35785f0db60d. 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/FIPT61100410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ba8870b2ea58b07854ca59ccf8f8daaa1621f2fe63634b5254d91ac438442d. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FIPT61600045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22f7a0b1021e12406c270246de4cbdeadb8cfdc680230c4d0c7898924b12f33. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/FIPT61300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f3c40bfac422d073e4140041eded0014da9d229ff163b3bfc11ed1020952a5. 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/FIGRF2100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd2d4e604df964399197de5d545bdcf1033654bf3fc4f49eb3906c557bafb95. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/FIK3E2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc005eba37fddb0c178226e6c5d0f43e87040dca6950731507ddcf16a57b9f5b. 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/FIJM92400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02e7165baedb6976734ef98b2cff03c86bdddc68f7630a3808c27b3c71777cd. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:28:36Z), 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/FIRHP2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1762d467a3914adda648bd93a6267a61f5f297437470ae941dd8163e5f202e4f. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/FIRHP2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93623387919abc36b613d0df8808d5f178ca25467fcfecaf22bb759b9e60a7b3. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/FIMGM2500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e2b8c1261e7af28a0d7d3726e1aef301e64462cd5d48921df1911a0d16b17b. 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/FIPT62500042.