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 0xe4ed1277158d416c247399bcf27f284b3f4b86faab38dfca1b312a0c634afb2a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a5ccae1-3b89-4f9e-b239-79f1f368fba6.json and https://artists.proofprofile.net/proofs/artist/4a5ccae1-3b89-4f9e-b239-79f1f368fba6.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 0x929d3daa932cf03048cab0297d42cffd563a63e63598692530f458ab0f2d2ea5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d952a5377228b8739d4a53855dddade2477aa3cf1c83ab8f8544a3bda369b9b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZDA61843229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e3377d7f8b79ecf0a11a02d6335f98cf3eb605810d79a8de0c7826129745c1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e107420e8618a67ff97b61d66893add1e029a2531a53c259a22e2e2fe45638. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA61843231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcfb751c95949dddcaba9f1d559063736c941ac999501ecfe7e76034df04302. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZDA61843232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542ad9437db3758f277be6ebc3f5684975473caee6495d16c93a2f5468ada906. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb745500d008f67572b219054b985788d71f82ab28c430c7cbff6291bd2e81bb1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZDA61843234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5136d031837dad7c03672a9cba1a103fb8c210d90e72632fa3a8dab72d5b4ce. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDA61843235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852f818c3dd054ee36e00b5da08578a7b7f8fb6ade63cb490dd4be2ae16d3e1f. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA61843236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344ee3e6cd2bf841eb7f870615be6232b273b2ff4a118c8aa62c527af5d1d5b0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9037703e4a4f3f9171d65ac6a289840f4f1986375f44567eabc9d5637a2ea5a5. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZDA61843238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660aad982ec3281e23d0ed08fdb07025507023f43a515a5c04c4539c5fc7b594. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZDA61843239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded667f0ab95013d3f39c38ea88d63b5a50e68260f4f248f4333f5be7dcf023c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZDA61843240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a4d87e8e8fc0038354378fc3825e4d204b9e4dc7e5d5278933fbff11bd5fce. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2d7be91261c5ab847b603ea2bc15baecc3be42d23024027ed5117eea16149a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2928af05ee2f70e1e0445797549208124bc9c15e7c122573fc7721789fcddc4f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc342d3498d016d7e4795c24c8d895a43b74221f255daed57edebf4f5722567c9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA61843244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770d29a651787658450cacc24a4566aac1e757ccadcca883034263387da7aa4c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZDA61843245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbdfe1fec5b779349439ce99883cb9131cf45c17ea437552c1df87dd7d28cb1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA61843246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dff4387efea18da1db80c476368a8694da757199b0e59390baa02c38dba871. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDA61843247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc96faaff2de52d2a218cb3e3337b654feea901221611ebc7a41ecb57812169c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDA61843248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fc81c6dccf0a1bbfd3a23ae56505eb7cfe52eea6117530bde7c1edd3d5517f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZDA61843249.