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 0x349a9210883bbc5577b7afa61d0230065c77dd71325cdce93f83617b13548427. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3d33017-1841-4d19-95ff-4a21c8269cb7.json and https://artists.proofprofile.net/proofs/artist/e3d33017-1841-4d19-95ff-4a21c8269cb7.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 0x26e817f69fbb2f6030cbbb6ffbe0012a536484c8ba28993df151072c83faaf57. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMZ621110024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa676ccea580ada72917e06f49701229c6cff6dda8ff6c63460283c6948c046. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMZ621110025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae2ec69b25623e4f996eb4318bebf30e5662f38f85311317cb88aebf6947495. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMZ621110026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b498015a7e7fb4017204d0d05b0633fbe6dd1a9815daec0a08084ce0cf48e6c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMZ621110027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0036ea7647490468bc6195c340739b766c56795916fa9dcb13baf14358ecfb2f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMZ621110028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b5b9377ec601977797742b948635f45d7ec238992dc95b19b7474bfb4d2935. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMZ621110029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8287c3f447e733cff20c24967a8966e1dda8114f5c80b6eb22cf6b07327b3004. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMZ621110030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90bdad00b5739c49aa7af0fbefaf4f0e83159faf71739fab229765c6a314461. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QMZ621110031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34b52e02ab7a0ecf5e7f99e6c7d03987e6dbf432469acfe206bfdbef531f6a8. 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/QMZ621110032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9df97e465cf45165250b007492c713c7b32295f79b6e10bd749745217521d8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QMZ621110033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4f359afe88fa460c27595365268765e67dbfc4f85250148bf76f94671f1e3c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QMZ621110034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd05866212d5acba67a5261efffef4016c459a845898b9ef0caf4a0e271fb7e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMZ621110037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9b1065f73b0e6157800e1fc27ee3a16db36eca877e379074415b1a9572bdd3. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QMZ621110038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eab5d2c18aeffbff14cfac2eb71b710465c23d659b464e3776f9744350eec17. 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/QMZ621110040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819437f66d3b7cd3db2b2fad1ccf79f9ac03b9935d36dc9cef90b2c19e013f3a. 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/QMZ621110041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67843ab0a64244e580e56ecfba0fbd6b5f38d82d8b3a86ef32cf3f3e78e50af3. 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/QMZ621110043.