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 0x824fda3a6e650ccdf9f7835f3e6ca503594cf21f19dfea9d458b42de4c99afc7. 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/7c86c925-8341-4ce7-b9cf-c87f7246edd5.json and https://artists.proofprofile.net/proofs/artist/7c86c925-8341-4ce7-b9cf-c87f7246edd5.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 0x6c89a6c219045f497075201028bb99425d63b6ca9b96a392f440920097ca4c1b. 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/TCABZ1481462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcd74496194d4950ee64374ff9f095444b0ec7e69dc06ce50e9345fc56226ba. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCABO1374175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0bd14c1de97e01c916fd5b8a8607f463e550e64cb640c8e117cf1a779d9e96. 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/TCABO1374176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8c5c970f1780b7ddc06f4bcc852f3aba45956e9312c4f527cb26e2295e2b6d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCABZ1466581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5da2d3fca1124fb10601347d6f79cd545ab0bbb4e3e8408d35dc33a2cf3c967. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCABZ1466586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf06ef90fc452f2503a55b1a5f8bc818eecccf28172917f1eec541790d14a0d2. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/TCABZ1466590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3358b73b997778a829670f647a85d57e4c1b5abce8b9e9f6da4e6408bb4286. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCABZ1466596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d6376a951b7ae17a43fd4f3af1eb97255bbecceb4d7e51d7f3e8d6d2eb3c1c. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/TCAES2001436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2e83cb50e2ec79a1b27a64332f7b74a4a966b30d0d4f98343775d082f7c307. 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/TCAES2001438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceceef52cb2133376d64efb09682803edc3634e1c9a9555d833f88310e5b2539. 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/TCAES2001443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde91a6c36061ee996cce5243efd36192522a1039e2bb5ae98b6e848a5b7ed337. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAES2001449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5470e0a69d6f048186e186515e4b154ecfb3e4193a332e66b639c71da3cb3a52. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAIT2439421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b742ea87616c87a3457c898121d4da866a234900e0a8e57d4dbdd6f0f137930. 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/TCAIM2498171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235476eb158cf9bdca8f8777067bed7596cdd50492be8b6bebb24e08ddf29173. 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/TCAIT2439492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2db39c2a204fda3832db9b2297ac69f795bac48ff08bdebc9bedb0ccacd23f. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAIT2439506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb13dc16e35a799bd53d6d67da1dd92397ffd8a7197bd827daae793d980b526e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAIT2439514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f77385e3f9afc33fd1cf89ecd9c56c83c8f4647f490f453000a1ad1202d5230. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAIT2439535.