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 0xebc3e1df7888b00e6860149aacc53eb9deed18a43768c15f063a60a44d6b9d0f. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a56497f-9fed-4aa4-89d2-24e7a3500e85.json and https://artists.proofprofile.net/proofs/artist/4a56497f-9fed-4aa4-89d2-24e7a3500e85.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 0x6c5324c7a22c93e59f2f6e8bab01e7e296fcf906d4bc7ace0d434ffea26393d5. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USCMG0300339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63985c2864b361fc221e08d9fc193a98961031ab70c16f0e6e93255b18b1e46f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCMG0300340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45108cb15bb2132aa6be3220541febd40fcd47ba92e83753a3e5388ad8f27176. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USCMG0300341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bf588e92c88bd957db32ccb1fa0022b15c277b93592c6ecf7be57ce69cf6c1. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USCMG0300344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe9a889c985c279993719944cf311f64e3a82c64b08d677e60b4d54eb7a4f8b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USWR61100823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5dba33ea516f32830f29f96518f22cf399dde3d2d01890b80e4c8676a970a17. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/USWR61100830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9294cf6a8406678e966c124e9edda69ecf89258a8dac814ed57d14ef929e8283. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USWR61100239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fae44ab91973c1702f70c1b785f82d96bf95d31737201574abe5380d758c96f. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USWR61100240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a5dab1b9a37d3f9ba8efba1d5ed758e064779a534d247af38645726fc5eb88. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USWR61100241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf384703080c03dfd36857bd58597cb4daef2d2626c9b9eda455c7063a2572313. 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/USWR61100242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494b27becdcfe41523f467c74e5a5a4a5727aadf9ea82ef55e5259ccdf24a463. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USWR61100244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29aa127bc54be89ed773f8dfc1ddfc45e489443ef64d7b5077a3703694213e53. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USWR61100245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58723cba4ee19aec30c753393eb6fa5ba364814b2860ed87d709b0a2f83f2c54. 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/USWR61100249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4eb1647fb05a87a1dee7008c253970e91702855157c18329a40086ab0e18c54. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USWR61100260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c6220199cc0298c5e221e804d98c8109a06d51328c836d0084bd6e027c5987. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USWR61100250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xada0068746c5dc8db0b4b7f63e25d2be02cbc654d34a94e7733f1de2aa7532b0. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USWR61100251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ed0ee239fd46c6724ddd58e863bfef2a075a1d383080aa7b2d4df65f25f800. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USWR61100252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40ccbbc063590dacd7b83fd25d45c9acd2eb9fbb8ff0982258d6a276c976bd2. 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/USWR61100256.