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 0x06e266a90e20a02de5387664be58a03210b7c384a12d59a6a0f69218219b8b17. 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/bfce55e6-9777-4c47-94df-e4ed887968f1.json and https://artists.proofprofile.net/proofs/artist/bfce55e6-9777-4c47-94df-e4ed887968f1.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 0xf8a4fdd70c7faa634192a22fc3f266fe531c1cf2e622e60f1cde170a1c01868f. 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/PTJZ10900047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f2d781e55bbf711ec8b6a7d76961c07789fe3d254f89611be398412dc33b66. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/PTJZ10900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4420c9598548bf58cc8de345a7f49b951cf93afd2b0bf039c2ed5cd5607e2701. 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/PTJZ10900050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8787df26c360c49d5d2c964000329bec4f2a6aa2f7d65a4d9e4169d00cd9eadb. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/PTJZ10900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905a1581b15639a9501c4d585fe73d027d0ecc6cba2567f55e866f366f47b124. 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/PTJZ10900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc706582b706c0dab00da1f9dd853a35540d1303059e3d36e981d20101c356e9b. 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/PTJZ10900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7d9e6e6792a4b109f40e95772c0cb9a000f171bea0554ca14ad1e994a5ae2d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/PTJZ10900055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa36b7b439b72cd1d8f190720d7952422f874fcf56363e82719a867fdac8a9c. 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/USKO11400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba81d0c2b9f566daa157955021bdb5f52f311ece09c1efaaf95e068d7d0e04c. 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/USKO11400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0182aa452d142f441d3191fce6405895a9643cff9a25d45359502dae764196. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USKO11400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffdffea4dd1c77e8a90c0f1c515beac255fc548e0dc9bcaeea5ad9659624d73. 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/USKO11400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885bd0932e590f9b320693158e57660e959f323294e366a5b45a5eb98fdb2042. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USKO11400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ff0855a633a85e88cf70b5bce1fca527371a2c4f1ab8b1d0a4ecce252a83f2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USKO11400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925e364114bf9beaf5fe04fce23f61c55b5691fa52fed2eea974d55c3d8eb726. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USKO11400084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84cdd82dd1959c19545a1caf8d7730122ab4577ee10907de7b788faa15379bd. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USKO11400088.