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 0x3384b1eb8156b5523fc3963038bf2adcb5ed4afeaf0d9e645149a73c9eb61ef6. 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/a2275a2c-dff9-4161-865e-4ea0fcbd92cd.json and https://artists.proofprofile.net/proofs/artist/a2275a2c-dff9-4161-865e-4ea0fcbd92cd.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 0x16d03bf62780885b6c238343e499ed6c7d6f687ace3c999fba67cee656aadc3c. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZHN72306318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb57c98d00c065ecf7d31335da54cfe503070a08efc726c4a96e0db57ec7476. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHN72306319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5eb6501c0a8593ef30443b1199d47e5a3a89315914882127794fe5babe2ed4. 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/QZHN72306320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d12eccc855afcbecf3896cf56f5767810103947320a33c8dcf1da419ee97d2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN72306323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3033a5506d723ee83b3b0095d8ea248b4bcbe401972b99e3a6b9451a010a9b1f. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN72306324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aefd8e8053a70e4f47ae577eb6bba9aa003c1567f29d2f65f05d45becf63680. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZHN72306325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2fa3331bcca440cb31d062c555052ce8f6ce9c7447d8528af223a595dced16. 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/QZMER2341703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac7dc093ad52af1be752dd64a3b1e0997a85d7c877a35d8d8ad26161ac031b3. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZMER2341704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91fcc248f7636d70ae0864ea26f8e344b8197da8d3564f50c4116b0daacf119. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZMER2341708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9174974ebe9517b4fffea1c61bd87f1aaeea6563f964472176e981842a1c79. 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/QZMER2341709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fec183175b23366ea98b002034d6b206666d2a3a9e11676823d431af1815c1. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZMER2341712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b260397849d83586ee377eb32299b37251a091043a13c3f123d257f377f27e8. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/USCGJ2582266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b2af1c555b0308ea7e44b39a8013e9f961ceb27a986b541108c61ee2b304f3. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USCGJ2582270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0d59db2c8808113400a3d0c3286c9f9056290a6ee6710727ceb0681870f593. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USCGJ2582273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eec7c8faa3bfcbc7ef46f2ce05ba6b9511704c15c20903c9d8026ff4e313116. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USCGJ2582274.