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 0x5226aca3880d06e6df9252b18d10bcabb189b4ca7baecb413c2b1c3ff4a1a4b8. 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/3959aa85-a3f0-4165-95b2-aed497cd2e1e.json and https://artists.proofprofile.net/proofs/artist/3959aa85-a3f0-4165-95b2-aed497cd2e1e.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 0x58b65064b6d5c0b1c969448193b22e2d6bffaf162992f732e98db4ac23ff6cee. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QM7281729914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d39c001c8d1a4882ab4dbbbe19b326388068615b4983720922692ff4fa16ad6. 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/ZAC032002450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ddd8074ffbac8de0525f8cc3d7ea6d87638f84791a2efa15405f25e11b1b6d. 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/ZAC032002451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a170e60890b47b79047037aaf552a91bb45cdcc3fd0e78eb18f2f534b6bfcf. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ZAC032002452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5124f8b617be66db265a02f37b639a5a04735a911e30660fa0d190bff6f5e4a2. 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/ZAC032100139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3e7c10641db835d09db0a3f54b3e5b19e3dbd700ea773fad80fc60e96b84c8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ZAC032100142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a6d8830b50f99b3f077ce696fc925aae6cb98ffb2090001e453f4db3333fb9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ZAC032100145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d73a4bdcd7ccc51432bc96acdfa4f4a3d6f67242c5bfd01db5a9ffa9c676e4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ZAC032210613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10dffee6848801c2419608af10999a271f23655d8bee06d5bbd055ca0ff1690. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ZAC032210615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39153112a74e6e271d68f0548587cb37a04655dbd9097003d7823ac3ccad9e6a. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ZAC032210618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715a0c79c3d153c1792ba924a8104bdc842760e3ef1ad1bfad3500def4c7db12. 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/ZAC032210620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96f4f0491fb63b2272f9aba96565e89739946fbfe7050783f79c26c1a4dfa35. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/ZAC032210621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbfd31392963470ca9ae502e37c820e09357e8def73e69e221724a8f97c9a1a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ZAC032210622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2741b98164a89a76cfeb3541872b24b294add6b3b4098e33f60e5b1c6d6bf8d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ZAC032210623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f34f56fe4a1c907081e071ae5b32e43a57b30cbeca05e8156c93d9f64f66b4. 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/ZAC032210624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90befc56a9a2a9fee8987302011da75addc0d646b8e49c3acae20286f868a0df. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/ZAC032309420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5875171c5ec550c3cbd52a6b6041dc5fd740d68fcc069cddf0114646abfa409a. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ZAC032309421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf990ecbe44910783d8353d53f6f37b3b6330f89731dc758750f33f0cfbb5c1f. 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/ZAC032309423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69259ab44296780f69a24fd93590bf32e25e6682ee270803d7df104d897cc34. 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/ZAC032309424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c9f6d898bb5dd9e5f0ee08ad8e28c94701feda06b39c361bf2856930f42863. 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/ZAC032309425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff8d63ff88bc11640628cf6708bf53423470f7b1b305f2b36b2d7d8fc0f0165. 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/ZAC032309428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66dab1f27ef83b732bbf6a3627d91ec4a166d43803870e246d43aa9bb17a5eb. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/ZAC032309429.