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 0xbc574b74efa214ef564d8906489f1a5c9687bdb62aeec0b92619fa28b60acb65. 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/33d79bd3-3c69-4ea5-9e05-ae4320460116.json and https://artists.proofprofile.net/proofs/artist/33d79bd3-3c69-4ea5-9e05-ae4320460116.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 0x7297a6e6df482ba0b96d32d521d764bb8b2f758732eac49056db530ee89e9bb7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLUW22302136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5b6915b42cf77610e3e1ba31c47df087e2516257473acc8f5f84d92b8993a1. 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/NLUW22302215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3552c23c3d20493a35d65e01d9fcd3258eed9186a6a67c6bcab5b8766e0aa0f. 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/NLUW22201656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a856825898ee07c7faca1217210bc37470fbc4b2bb2a34e32eb6a3b683b571. 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/NLUW22302032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebd786dc1a3ac63749f2c5736d34825c0a793442015d0d06b8867a0aef7de7b. 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/NLUW22302033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dee84003f2b50237567c110cf4c55cebb221d37f3023760f09e8ff654a90e8. 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/NLUW22201685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa52d346993c7f0e7f6d6662961fd03415c362a0a61f3cf9151d38e0346a0a74. 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/NLUW22201686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba707ca076138f83ebd3fcb3c902c972980c887baa60308e9b72785a2ad2a65. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/NLUW22302102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec75f47ec3931fc5048dbea4ed49cbe3e74bcf443c143cfd13d31bd2f17a32d3. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLUW22302106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cdd2b0737490751d9b33a5c444168b91f75f15657241ac4eb05923bbc1bf72. 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/NLUW22302110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b22c6342f3d937abb199cee7f1eb98a8eaa89c3b77fb9dbeb039ba75e0e24c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLUW22302114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800186057defe024bab6369edf8bb57b47ee8284b7d54edf76d38cf045b35b03. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLUW22301978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef63c918d663b6e624eb648af6915e3a829a1a6df1dc15e4c3dbb59d060403e7. 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/NLUW22301979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d29c9f5ccebe055e92a11f80068aedb94190b274865c665e19b0386d8f4ba34. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLUW22201627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c20adde9ed57955250a8e5ad7601c03e464b8ba2df59bf21ce5a1f77199ad49. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLUW22201628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a040a04005251529c44944cb5a46a47e520f4158e44a2bc3e2388c45b12fd7. 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/NLUW22302079.