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 0x9648c316b9ea3915c6cf4dabf839de657f0b57baf0814e93b47496c7f33efb4a. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4703cd16-905d-4877-9b73-a18f37fce5b1.json and https://artists.proofprofile.net/proofs/artist/4703cd16-905d-4877-9b73-a18f37fce5b1.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 0x1e343e52ae429134371fca883eff6fb3ba04e476f7c309d6baa8ebe9376da66b. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ZAHF12100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65da533b4ed21ecb379c78feb4107f80b836ac3271c89a60f404c1a17b666c0a. 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/ZAHF12000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3864af8bab357e6d826226c431b77ae57cd53c5608cb5e487ae184fadc0331. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAHF12200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf252530f4da615e399aa2cc839758106e4a5ebe595a5d7d505d05340ddc66358. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ZAHF12300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d81daa3d112c902de29d35eae477631baf6a980d6d5a41b383f0e4508e97bae. 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/ZAHF12400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b22c76139a231850e2b820056e050fc7cc71045773b2f231fc3b91b0fef75df. 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/ZAHF12400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015c9e073dfeca5cd3d4e63075b9914271a64a73d56ebac29ae46780528ef182. 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/ZAHF12400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4515a081162a3f6f60076f9c7c716bf31c19694c5bc128a133fa5b88430e1c0e. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/ZAHF12400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee3bcf26d02bef785fcbcea7c82d47344b9ce500b3461c5058999e70c284789. 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/ZAHF12400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98edfdde05c4062c0acbc9696b7ab155e3eeb42318647f434e33f56b7388c3b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/ZAHF12400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa959afe6098a70ed33c69cb2dd51b3b7e70b21c7ea16a5580383522e78453f18. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ZAHF12400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00e98710e194da490661fdee1001b6e3fd7b080a9344f602514f1f52170faef. 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/ZAHF12100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56146b730abfba2ef7a40e8371392154c882fe7482cdfea07362375890a790e4. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ZAHF12500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b49c945bc4610f9e8c09cbc711ac649f4e8b5c0494a8917e434a17e5c6a4a24. 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/ZAHF12500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe778988243cc9d3c3f2a0f467f9a610d4eab856d1ef2362285d55e47f49916e4. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ZAHF12500027.