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 0x47ce66fbae1341e0d7ae363ffa623cbe159100cb4f4b255f3439545796c7f524. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/701c1319-e9e1-4502-8d36-287f9cc73d16.json and https://artists.proofprofile.net/proofs/artist/701c1319-e9e1-4502-8d36-287f9cc73d16.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 0xe8a421831101226f532925f5e47cefa2dc583d87ec3e6c04f173b1e41df0a95a. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZES82198929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff9604adbbdeaf06bda44de46b152f6b0445cbe15e988f7001137302cadb86e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZMEN2282255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48497b2695f98628417368b26196b1cf76eb3b74c9c0de81349501a296e8d56. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWS2228817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f7c25fc3a7b5a4b61336c7cf8c6126dd5dbeaeca28272e24445f169c429bef. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZPLR2222945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9906a8039c05d52c86f8fb752eca1d1c8c2970ce569f763612efc3b296fb6ca. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:24:57Z), 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/QZDA52323883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3367de8058c7bf68e84ad651518ec770b58816fc2c512a04e17280d6e241ce35. 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/QZHN92356328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ab8907aeb5f45a7bc7b409b8c5d3160ded81f31320b6811f81fe18750fd213. 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/QZK6G2394326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd61af976fa8e9c900c20bfa5946c2d7b4c8b4ff55aefb79829f78b9355aafea. 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/QZMEP2369784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727c022e7169eb2122dcae18a37193f4101e2bfcf38757df583be6794ad011db. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T18:21:18Z), 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/QZNWW2371040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca62b474072e7d4030c4aa005b900174ce9406c0184a1d991cb498dbba9357b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES82459184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4056c742ddd5750e9943fb50f70cec6e13ae0057f208107d6b55d08a1feee867. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:02:21Z), 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/QZTB72496593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18e80fb95635e729fe7203c6a5d1d46a5bac892abc6b95faf532e3a09382fdf. 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/QZHN62536493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13173afc18c4cd9b3031b5c5ddaa42a2d08d80b12e112f545efe5684da920b4a. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZNWQ2550330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90a07aad117ce7b596eef8f19a5d97c73f84a9844b0924b5be66831fc57d130. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTAT2547452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a75c905d050004448451dbed7bf0631380aa396a52a04c7d32f754062527f29. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB62557543.