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 0x233f7b2ad495d1d451661ade4d7d8218645aab2dfe9d41d17ab9861a5d53dafa. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/199d29de-33c1-44e0-82c2-9f40c53fb489.json and https://artists.proofprofile.net/proofs/artist/199d29de-33c1-44e0-82c2-9f40c53fb489.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 0xd2c1e4893af454cffaf35504e7b967d5d9508d3e5babe709164145993379ae6e. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USYBL2300580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ecfb956f36b6b03cc839ede3929945eb0e82496425c08d89b9b4c043b5e929. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/MXD782300758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24790c3e100269c8940e7b390aa59926cd864e8c5bf253cababfd36f2d2df281. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/MXD782300761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e9800ed1436b520b8d033bf1e14298da948aa4e8fee1d4467af3fe01080156. 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/MXD782300762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c32d1a43f4dd3c0568b18361f66ebd1f31083322f7782691669517168c6f5d. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/MXD782300760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ece9fe0f71862541b432311204e1829103b007e7e92c9bed69397286b219b1c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/MXD782300763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23ed5ee393a386aa5ac285ab5f93f869abdf57160fe2c0dea7f3e02a1601de8. 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/NLCK42341359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f71ad1f76abe65c5f0f0383dfb22ab63f48fd7fc38dc0f96d3a1b11342b622. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/USYBL2402275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47ad22761b4048ba4e74bbeb51022ddac74245f70de4e2bc30282602bb622a1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/MXD782500339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f86781a15a48695f6a877df4187bb463e3b397737778d03f23b6b4e21b637f. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/MXD782500338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2709ecba9e35aa5632c75bc99a269afb2f7c5d385bad96d19ed0752de63685. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM6N22577708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd991ffd8c25cd5dd556b04d6e5bb8d17d930533af860f4cc2be03860ce756f1c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QM6N22561919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1dafd2899f35e8a8068e63b9d015d8e293ab0a3dff7c82382047fedee0fc8a. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QM6N22577795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f969a01694b75ff438e945c1f51cff1ee0bc07c33b754c9c97e6f7eb80a0962. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QM6N22577801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2709ecba9e35aa5632c75bc99a269afb2f7c5d385bad96d19ed0752de63685. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QM6N22577708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952be7de68da8f604d2b2e371d3b45c10972657f43df41f6aa7fd52424c01e83. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLCK42237733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf59aa7ad8b70f87f5d6fa6ab34466d9952196220d62362fd5f7ff58a967a882. 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/CA5KR2508968.