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 0xbd68f1b7d4df48f386ca3797d3a775c70cf219e485dcf2faf492d3fdc0ab318a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4acc6f4f-f725-465c-9b46-9450b02588c3.json and https://artists.proofprofile.net/proofs/artist/4acc6f4f-f725-465c-9b46-9450b02588c3.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 0xdacc2e3f635140ed792d50357996c753106abf721376b74d6ab59350b8cc383c. 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/DETO41600462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c0fff067bb0d0b5d24ab53e2a0eb93cdd0e7818212ae45cc5650bc0149102a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DETO41638665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e4dd3b0a96e2f41ce982d5f5f8c472175aa33b359ee2b2a9b90b7982e34732. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DETO41653439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0279ff3b53f4b50e54edf0cc60b663f533083ff6b03e7ccf8cf1b6df945be957. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DETO41612828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb774c4cf4114d0c09755ae3bf15aa3010e92ae82e54c483f0afc1a4d1971342e. 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/DETO41601101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36eaa6fe7e4c3ae69d5bf14fb6cf4f45c0d3752b728341297eed624f01a5137. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DETO41615240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8101d212125f54b49bc915cddb1432275000a452bee82dbcdcf790f78e3d5c8. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/DETO41618186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6deb0cac56f43da9c9b9fbc42cd3f44726a9ca9b805679e0e4279b9a9c23ee. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/DETO41887546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5d155968699547293f9a8ed4acf40776113f0594bd168938be4ad7942b2dd3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/DETO42295362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2187e8237ac95e93fd194966dcf4c2c00e3a1fa45abbcf2071bd105cbe36a5. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DETO42051813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e7cf1ee57e8f83dddb14242cb4e4784473cd2ebec4998cb966a4ef7f8f5ed9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZAKB2349351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3885286ba15edf7a30ebf51faf9782947acc2f0c9c2482d131e1ddddb766fc34. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZAKB2353077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4aadae6093b3ad759b8093b4ce9a28e1341531a5adba5eda81ed77ed7b81e1. 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/QZK6L2407844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51eea10da4dbd329de39dbe3cf242860eac78df26fcf043bce32f326296580d1. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/DGA052441650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9926bd78d5291a3dc82ac7adb58ef4e3016b328de24a576bf854349a61cfb9a. 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/QZTBA2478328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2886a0c3264ca4cc2be8b5f8af1b23b95e6a8026a28206b07a2a44e4d143bb. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DGA0S2406524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019b346d15e2660be9c33ae97ab795b56e2c19838611dae20f808948c24ec183. 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/QZPLR2571245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934b332aeed33be3a346678715ee52398cc20f9f5e0e49ba9e14dbc266c59f1e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNWY2534942.