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 0xd84bfc5e3e23cd524d691adfbedc9caa80e0c6df2a46a92a36ca9f0869b3b35e. 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/7d7684d9-3510-42c9-a91f-046f5dea4dcf.json and https://artists.proofprofile.net/proofs/artist/7d7684d9-3510-42c9-a91f-046f5dea4dcf.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 0x143d55dec81404a1aff7a2781d35a529b17edfa789d91f157f5451843cb13807. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6J2122259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7ba5430092f90f14e3c6fa755d8d527b44e4e4253ae4d1c7fa587ede364c7d. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZK6H2190530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b749451b68ba164da56507f2d88261f339628ed20ebab47158b47b7f238ff2c. 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/QZFZ32201404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01bd3ad786276c5883cc65ca9eacee602cce210ed65023161bd287cbf693b53. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN82241032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef57652c7c1b52089232aec6d82950829abcba59d353513725919d27b810146f. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZHN82241035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cbb9b159512794f5b96f7b05ca0cbac51ceb65a26e02f3153a6dd982939869. 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/QZHNB2213824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bbb0d2dda040b8e85005eca929e383f10b11195c3cbe8bf813f0fa21548c18. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZDA42309881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ed26500e65dd3cd0614f88d75a5b4a9025b0de5f2eb0c222106020b47f027. 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/UKZGC2301542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee06c91d92d348a2947254cc34ed50caf5d3799d0167cbd72567996152ef1378. 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/UKZGC2302950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0cf3108337e39e5fca5d4d27db38ad92817ac0b160fd79da04c96d80cca6e6. 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/QZHN42500830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cedb8c70e99c6e02f684827ce00682ad843a35d18ec7f61a5f443940be31439. 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/QZHNC2585421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49574fc3e717707b02b5db29fac6b9f26d939588bde5eaa53d0f87d44e1da813. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTB32565514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b9bf014e35588749b700c48aef1e19a15f1a9c64ecf9609ee699f5fb4cc8ea. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZZ7P2554797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de2ae46ac10461325c0626b08651418a36e5ac5a20aee2b717f22fa6dcc33e9. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QT3EY2580349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976ae355e9bc62b20f7150acdf252e16319917866feec5f196da43d0c29d78b6. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QT3FA2576083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a1019abcf3b391cee55ce900885a94710087a64e684d5081d7c218c44da555. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/UKZGC2300472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1099041c884e748be0fa9cc065782b898341e707b4a1a9c4a0774cd239217c9e. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZN882394947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee06c91d92d348a2947254cc34ed50caf5d3799d0167cbd72567996152ef1378. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/UKZGC2302950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188ed26500e65dd3cd0614f88d75a5b4a9025b0de5f2eb0c222106020b47f027. 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/UKZGC2301542.