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 0x20ff2dcb5a3cd21e293e0eb65bc7593d70a60663a5bd80a3b1a649264cf29ea9. 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/a4eaafdd-646a-4b3b-9f8c-577d02703d2b.json and https://artists.proofprofile.net/proofs/artist/a4eaafdd-646a-4b3b-9f8c-577d02703d2b.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 0xf5b25b2e8a18fa124bc65072b990bca75bc8a0e100ca2768ea80bdaf99bdc379. 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/AU3O01702365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa26952fb56021b72f91e11c405a082cee430c929197c5c46d2e068f82468105. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/AU3O01702367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1547f481540c79fc498c07d4c9bc63882da5502d71cb52258fde816d7eaea95a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/AU3O01702373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fd41157749e90f1e563014b38d37aa9221697c57220945240b15c2f22f61b7. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/AU3O01702374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc88a3fab360269b136a64476dc0c2ae161317baac12503ed039c9b754cd003. 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/AU3O01702375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1affe8306ff234dddd6a3fb445088ac5c41d24b535a260ecdf5063d3b46513d1. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/AUZBD1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096f7332eb41fb95ccce43f8acf8f2d4a0f4eea910cfd0c5d77d30fee1e81327. 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/AUZBD1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e94ef5d64282702bb6b823886995cf7559b1d7ad8ccef6319a799cd2c602a34. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/AUZBD1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5f772047003920521e389a3d65463d7b0343c217d5446e1b479853cf662fad. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/AUHAZ2000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51801db83478ab47beac5ea5009bf757b13952c6695d69eea1ac1807ea3a2b0a. 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/AUHAZ2000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bbd13e4a504618ac5aa3f7ba6975cf1582d9bfbfaa010aaea000a4acf0328c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AUHAZ2000025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3694f0060bc0e3237d1943064754b12b28043a9f08057b73c7d4f855ac5524. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/AUHAZ2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b284b19facdcbc30746eeeff69aea784a9c6fcc7e280e960ec60387cf9fc8ec. 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/AUHAZ2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b4d0eafa7da814103f6713516e120e3703c8a1cbf3bbe4edfb39756017bc0c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/AUHAZ2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4c692e9fadafde4413f6a6cea4aa9965b4cf06684e74dca627ad72b19f6799. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AUHAZ2000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4283676345c5e12176d1ac0f9167e744a64a322056ba5c1a0a8366ae09dd429e. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/AUHAZ2000072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad35455a322db26fcff1052a8664a7f8bddffed456bc996c785223a91e4f0e1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/AUQQM2000003.