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 0x11e4ac763b8487f10505f0845c9717fabf5c2fca1c95e29ac0e007b49feab408. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ab72fb9-224d-4a80-99aa-7161cd3d3522.json and https://artists.proofprofile.net/proofs/artist/5ab72fb9-224d-4a80-99aa-7161cd3d3522.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 0x2939fe5902573d7c00f0af91eb4a3ae4ad7d59b92ba35d451679da81e263bb76. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GBLV62207113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4a8114060d298f8b43602584daf441c1d0b847f6ff4244d9052bee0e4dee12. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/GBLV62207115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d436248c3e17132dde83d25848b0d7c72d8ca8fcd4d8c8aeb89598d66bc066f. 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/GBLV62207116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53efd1097cf4875b0f27ee2aa024ad524e6b88c18575fa68bc3e60ba7c19a80. 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/GBLV62207117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86516a5de4b469ad5a74b42864faad433db7e63ca8a123d0220b28da3e63ea05. 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/GBLV62207118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9a91c61e513bf09e60c7ee08b15c286be4edc8160ab37f53c9c179719105a3. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/GBLV62207119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e64691ad144c316144afcee06232d0e92a13c75e3b4ecb8089a8b0a5f80fae. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBKQU2499917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2987eb67a8d3fb5cb8978eba3d2b537f7ab5932f15f334e6a33a2231be2f8c. 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/QZMHK2300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8911461ae1477aaa59ab5c70c5ffc1ce2395db4299e8983d8eea7e63aaad52ea. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZS642486308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437a8999b636bab8cd8e3affa27727a9260a612418bdf0e7343d5cafd0ba5030. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU2093450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a158f81a4a88fe8fa7082249208cf0a776dcb4761e13587cae7daa1d9eb7d7e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBKQU2077549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8e4d992cc062eb40d2a82fa664f245258581d868b7085d4528700f5edc4122. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBKQU2216378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00909b9021181cb95745d72884fc4b776536d21d3a5c8e6fc8165a2aa45722f0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBKQU2401596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68925e9ec4d2a5f84e365c633a314bc119d676d2da1300bac04faaf1c6e736b3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZS632581209.