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 0xce777397e20a22de94b5698deb7ce48f293bb1b9eee35c7905c930b743f77c80. 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/fb2761eb-0320-4779-b341-5dd1fbaff2a1.json and https://artists.proofprofile.net/proofs/artist/fb2761eb-0320-4779-b341-5dd1fbaff2a1.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 0x0b736bda7166ad3fdcbd427decad8cab59e2e9133bc9efad2d8e88327267ee46. 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/TCAGE2247183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789847a7a996e401cb6bef8f3b192adf0e102735acbadf542f160fb1c4383936. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/TCAFZ2121342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ee801a9fc8ef9dcd52a05a0009af45aa347f05ef92d7680f4a8c2456e22c19. 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/TCAFZ2121357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6ea17c0fd4e93b99096f3cc896327e6e278a9fa040917e1fd0bd3f7c1930cb. 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/TCAFZ2121371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6412f77ae78f45437c716cf4928c99b7281e440e61fb2293ae2ac398861a6527. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/TCAFZ2121393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ecee9d46c6daaaedde4ed80d7073015fb836fb2cb3beb0e06a7006f2da974d. 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/TCAFZ2121412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45dc5b10d3ba6a4984d1314453c4338d25f6d73997d0a5af2040e08ddbb757a1. 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/TCAFZ2121433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664fa2f35594800405d634a621451ffb138391baa51facf166a4b3387627950c. 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/TCAFZ2121438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55092b3444bc78a2f550bc880f7bab0c3ae7019b35152faf05bcb37f72b05d4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAFH2002368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6be47c20a77b5d1716cf99f97cf8674c2777e9478cf11cc0a405f0adcdda54. 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/QZDA62139576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a486018668ca2bf4541b9247090c8b3244afb133d7de8e072dad14e291067fb. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/TCAJI2526887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9ce1443af266814b250b0c620e947570a1cf45fae571cf8ca93200f30096fb. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TCAJH2526912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf5b76da4dbe0e6aa0a2b95aa44d25e70cce04ced2a44b5e7978faa1f675972. 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/TCAJH2526959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda020e8edd940b40990cbbd6efc0d4c5a437631d3b94a9dbb488a5884f4dfe98. 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/TCAJH2526978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202e8aadd08562cb5b7b19844f508b0d92f28292b8ca4281db743324b0bcdd2e. 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/TCAJH2527009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dee3d5504d5dc6619f0b245684185dee2dbbc611ea95cb1654e1e27a16ce31. 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/TCAJH2527030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5063765d040cc7a001fd8baabe8870382eb9ed9548cbd3a799807b14f5d24e4. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAJH2527136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5ffa0a3022e5f6424f6324412c5a68b42a0076dc7c22b6a0ae2af542730e24. 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/TCAJI2527146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74af5109348b29fe1fe037b28aeee67ba5e9c9c4426b286656a7fefa29d22c5. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TCAJH2527172.