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 0x5d5acfaadbe2ca4b20df31ec374d39f10a35f057e324e89a63eb5a53a5cfc62b. 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/72fdc8e1-878a-49e0-904b-c3fcec51688e.json and https://artists.proofprofile.net/proofs/artist/72fdc8e1-878a-49e0-904b-c3fcec51688e.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 0xe5f8f13cb02e1ad312af2d2ce68c5558dc3926aa37af44a1cd374983ba2664ea. 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/SEWOL1400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f511594485eb0d987a9f196e3e90450508d4ad496f7df4f020194a29b15937. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/SEWOL1400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ba32c66fc2095f14deecdf75ddf685f64329d4dcad5cd4ea8b7ff1c918ea04. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:17:53Z), 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/SEWOL1400802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97627269fd22086dc779a3ecdc38441dedee708aa980770615793a314280bf9a. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SEWOL1400805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671406e4503c6a761e93bf4c55361b01254e58be6ec686200db5fc1e012eda6f. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/SEWOL1400806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5ea5d04a8925a1e9a4430adf381417298cea7529cb613c7c92f57f158c98bc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/SEWOL1400807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3956d40cec749f824dd1eb38a6f4fb44a598b0429b02e99a53371838c66f15. 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/SEWOL1400809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3393ead512473e7066bfd86096e104f9910e5110e67bf95cbfc0689971c39185. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/SEWOL1400810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cb2441f64956fe1ce9c03c66135966973829f81d85945b0fa124560248e370. 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/SEWOL1400811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c0dec738bc2107a3391449d4e176a49f74339a13bcc3fa344c9c32db9b72b1. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/SEWOL1400801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1206313d600f5834928b8972b5e670f1bdc4dc61d03607df2b3351e22832e4c1. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:21:54Z), 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/SEWOL1400701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16984eb64736e2389ded8e9f5304ac4e9663b5d1734c8f001ec6de923b9ea55f. 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/SEWOL2000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36622927745d1b0e30ee2667385fcb79cfdc9e818f173396c508a693fd4a4b2a. 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/SEWOL2000303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4133aab4f4b46c736d72fab0922652f85d6a8a78b1b22552837bf82d8325e8b4. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:33:08Z), 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/SEWOL2000304.