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 0x3deb8b1258139864c329be730b33fb9e0f9daa77276e45694fd7234004754916. Chain 2 (Bitcoin): anchored in block 954004 (2026-06-16T21:01:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/32549b6b-0d72-4a1d-a270-16ba875f8646.json and https://artists.proofprofile.net/proofs/artist/32549b6b-0d72-4a1d-a270-16ba875f8646.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 0x45b79fb02ba1362714337da5108c9a59aa0723a24f782d4124a52d3250448a25. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2307956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac951a0eb4bf175e25116e5d078c2e888a41c8058ca387905b7c68cce9ac93fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKZGC2301375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb7194148985acab56f1754e73003efc36a7cf06dbb74fd7b576fa9c82c580f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/UKZGC2307953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da28b9892b4ef322bf783d8b1fa1ca69e6b1f70f66e3c32fb5414160436227f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2307961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ee3adacd7363c8962db578886b2e8152e8c8a60c33e4d30b90754817bae89a. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/UKZGC2307955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc680a2e9fb761f204333f88efc9a003928b9f4afb6860f47952ffbf0c2b53d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2307957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216ed3d5115cf15df6117e6feb09a89d06253ad507f8a53a6a8f19c9a7eb7e2e. 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/UKZGC2307960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f4bf4b4c090b732957c58695a6e8ad0edad94e032f82e0e595e559059bc594. 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/UKZGC2307962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc4ef6c7bfc168a82703dc4199f8fe07e648126828d84a4ee78ca4106f69380. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/UKZGC2307959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd05e727c2b337b785e49a285021479c35738d5359a17940ba4fe220a2aeede3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2305270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe762db0d0b9487b9c8013021b760360e2dfc0828065447f7001aef35174d7aa3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/UKZGC2302468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881afa34bd79f79027ab0789d44e036b112dd0191590d51c3487e4be4dad4fa5. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/USANG2295369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5698121174d2785e35c5f857987a7b6cc461b4c841988841a6c28e76b48949df. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USANG2245975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b357cffa414c9518bf2d789d3aba5ec2f446c00bb4887e96490713c272a372. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM3DF2219515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f037b3869a38f9ddf2fa304da00c404cbbb1faf9a52591bf872fbd72fae0855. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM3DF2219517.