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 0x650b1e1be27b83349a5259134623bb4b8110e0e50e38be0de91a3742cff22fd1. 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/46e52bba-7490-4b9c-9a06-5d009706e5dd.json and https://artists.proofprofile.net/proofs/artist/46e52bba-7490-4b9c-9a06-5d009706e5dd.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 0x57ec64656e4435da40792307b3811c6f6d3730e1cde068cef1221ac6b194eb01. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES75E2501296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f99eb066bdc096eb6e13d5b5926e97bd428c351206d48d9af0afdcecc0ad72a. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/ES75E2501295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77aff037914dfd029b0f565d334b5cf84753411fe08fbfaa86d524712ffd2ba2. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ES75E2501293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27e9e1126d3663c571b3ed50a82979550a7840a474a33ba4e1500b09dd99fe7. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/ES75E2501298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce7c04e079c3d2184bef0bad9d08f73642229d17c20d93d16bf245055048de2. 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/ES75E2501297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c72a345d9407974a270aa4aa53209233c04c1ce79f9596f8f19cd12834e1b2b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/ES75E2501477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c15677458685e013475898f6317976e5276665a5876e05812ab9b67fed843da. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ES75E2501474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6215060b66741046fc60d5896f9beba5ce8e371427da03d5e09ea17aecf606. 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/ES75E2501473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c721a8005f55793d32aed90a78f7afea0d1f2d2952e408c510cf625be51616b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ES75E2501476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3105edc3a98872125058926d5e48ca9a204d646739f547152e83d0df14c7b8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES75E2501475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd681b238d44a85fa557fe6d6645955cb0e159310ee4a349a3012d7b396a6ad89. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/ES75E2501553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569a47cda67cd1653e821ddfe1a16d21daf2596078a12adeb8b09198eee096dc. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/ES75E2501551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e74f518d491f55f75e8d45e890c1867e7181944f7f319484f8981de089d5e4. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/ES75E2501549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c0428200f5f227c281fa196ad2e09fe2cf31e46394486c886e8759405c914b. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/ES75E2501550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1965f235b2ee5e0acc3a4c09e2f34c682efccd49ba461148de0ad09a7291a1. 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/ES75E2501552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9396f5af856463cf57c097e35546faa61523e87b8e9d48b90556f965d409a625. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZES52527189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f698fe88c5f830a8a6ba0a57054aa6c38aa37ff69acacbf2033d3fbfcd1b5f9. 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/QZES52502974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215d759613e2535b2df77dff39633de3f5baf2ccc95330b952ded930e91fc811. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZDA82597070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875a9946c0380a3713fd673577076b19f14db57d66db7207b84143470bc08999. 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/QZES52502973.