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 0x2b49f6dd3958a067e4950ae9f1a7d357fe2771c4724ae6e3322587e52e34645a. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abe26853-f7eb-4fc0-b440-b37159c908e0.json and https://artists.proofprofile.net/proofs/artist/abe26853-f7eb-4fc0-b440-b37159c908e0.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 0x941fe3cf9823a9528b4adb78ad24596fcf61e255e272dc1a362aacaba76d3bc2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/IL1032050869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b21d1ae02a45d099c0ed76d2242922379c95621f1a891606e59ecfae381669a. 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/IL1032050870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37652127c842f38560455679bb020290ed49989436d8013ad1a0cf97e311d01a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IL1032050871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdb2dd1d648995c89ae6683079dfcf35303efdedbc8f5aa1177a27fdc530b0b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/IL1032050872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4379b045e85aa8d8b0889aab2f81f3bc96b7a29c479892978b10f8b74aff52. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/IL1032050873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd4cc10da1f0b9855308698d1ebfd98762ad78ba4206a6328c41060453368e7. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/IL1032050874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb277be369bf0cee90f0cb6b8786f16a21c4f61f8181c69ea5f4de3c03d37286a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/IL1032050875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55ae7bb7550cad147c947cfeff35706495e7d33742815524bafcaa96093ee8b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/IL1032050876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf223edb2003e231401a1d37831243c3a76f390ab32332cf200c993f1cbe728. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/IL1032050877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe092a9b078e51cea0342c68904be1b31ea44b25bee08192d0fa0940b2c40544a. 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/IL1032050878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0564e36275d93e56d44a4b4272cf6f4a2b16bc2176442ac12f76a817ceb41c. 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/IL1032050879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3df7328074c7859cc533e4d7f0426edda06b94f524e697cdba7a19cc34e5a9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL1032050880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829c342dfdfdd9e4fb0a6d5c4e501166addc605743fe788fd7f4118b99da136d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/IL1032050881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79542e6b962b5e4f41e725145a24398de9c1e94bc9fa1d69a6c02d0ec5bd0ae0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL1032050882.