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 0x258603fe2ab9e8aafedb18c69b918020a36ce8f97a97753ed3db5d8b2d449278. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d02c67ff-5744-47e2-b8f8-5110d72501d8.json and https://artists.proofprofile.net/proofs/artist/d02c67ff-5744-47e2-b8f8-5110d72501d8.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 0xb3b9006ec096bea5a48192707c66795cae24d502e1e01cd35c0b17782e167338. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZ5AB2477802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb391e622c2021334e8ba96117c32032bab5567c05a79cf4af3b37be91fe3f95. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZN882549284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b44a8ce8b37ce620408a94d11334cf9e34d35d9f826a86e3e90c7183abde130. 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/QZN882549280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871a51e7e3af7bb57e9811a878e065c333e2c068439956071137c3d5be3d5d14. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZN882550802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb84f8be062f7e3849291699e632b4ec7b915213739a3e1421f35221a2e611f0. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZN882550798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96932b86499b20ff038b8ae3c93c49f84bf97dd6390d318e58f7db111b2eb44. 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/QZN882550803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec8ea62e1822605cf195ef33246d3de0b5b92353dfef8949f3736543fae8a15. 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/QZN882551539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3bcb199d7b21d0d3ff4690433e77222316ae8261cdf7226e4dbaf792486d02. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZN882551525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496e90fdb1018a43b587687f2f9b2e10c4c5d3607dd43b374258e6bb32dcb614. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZN882563029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd468c9f79a4974f6ce55b4d0cb057f6efe726bd61bf1c668b51de86ad56593. Chain 2 (Bitcoin): anchored in block 957839 (2026-07-13T10:06:30Z), 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/QZN882564602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d01ff13748be05662e70a1693a17577248860e8fac5e5d60a879f7f77269be4. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZWDW2554480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917e3862c343caca22572147d358ae9d9bbc2ae8769eb150c3573852e35561a9. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZWDW2554540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73af887427d7b57f2aa7f4f653c4c48d349fa336b04bd2c78a766be5398d9f4c. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZWDW2574148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac352ad20d3a301e4b3cc873650a1f137e95389ede19ae676b6df47cb0abf2c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWDW2576105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107ea960ac9dc993d0dafd41f6082d007695c0b9ba677f6a5e339d8a4d61f57f. 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/QZWDW2579686.