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 0x59cb759283752fb1388a09f4778963e06a219a2e5da4bffe560c9c24bcaba9b6. 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/867127cf-e378-466d-b25d-3ac754a12060.json and https://artists.proofprofile.net/proofs/artist/867127cf-e378-466d-b25d-3ac754a12060.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 0x53dbe41849769d3d8c1dc59c30b7ceefbe0e6c9803b54e402e7da3f5ea34aaba. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNJX2268434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc493befe7aa0dc165ec379b785faf9383079d46ede7ff8d5926f1444d4f2a5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJX2268439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8388a77491904fd9b8e28ab6a0bf4f478674578a655b5371759c90652b93dea9. 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/QZNJX2268435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42da6c58bd5229e6653a191788a02628424d2f317fbc7dd2df3543aa4da1086d. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZNJX2268438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584343e376e95b4dcef834c2a6655e2d43d5327e89823354bfc6777774241209. 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/QZGLM2360605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53dbe41849769d3d8c1dc59c30b7ceefbe0e6c9803b54e402e7da3f5ea34aaba. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:03:46Z), 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/QZNJX2268434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc493befe7aa0dc165ec379b785faf9383079d46ede7ff8d5926f1444d4f2a5. 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/QZNJX2268439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42da6c58bd5229e6653a191788a02628424d2f317fbc7dd2df3543aa4da1086d. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZNJX2268438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584343e376e95b4dcef834c2a6655e2d43d5327e89823354bfc6777774241209. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZGLM2360605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5028131d86d25ea10d31efacf5bbb7b39ed895141194dc692ac3f6c95f682d59. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:34:43Z), 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/QZW9L2453883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29054e0a6c547a13325f99494376631c87b4cb97a032ca25414137023bd6aba. 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/QZGLM2360547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1a7507cff04dc77e42c8eafe0c21e53147f2b9d951dc1530b3192ded0c944c. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZNJX2326971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ef7ec5a22df7cdb8542e39be2a34e47adf0900ebd96dbb35c235eebebb34fc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNJY2395688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae3b513770bac48eab94afcb753cb370af529f5fdbb537db7964962ad0aa0be. 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/QZW9L2370782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76598b0d56b27f837d7d6b55d031840942fd6cfa060144d36862cc9b3802ba62. 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/QMFMF2416393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33715a548bf5e489cb48a10e9c2b59169b71b1fef46b4ae082bafc49c66fa041. 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/QM6MZ2594798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774eac3e2c298fe185973f0a66435687e4106190e6e20e9da0d0227d08e1c064. 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/QM6P42599581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe826519c7c4b034e4cdf8aa524beb1b3b4cb5fb80da1f68a37bc15dc4d0119be. 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/UKXN22457937.