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 0xe38705175d26855db7d70b309b15549ea7710bc910282528fd93fea07dae908e. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07f3cef2-92e4-4bfa-852c-565efcd345fc.json and https://artists.proofprofile.net/proofs/artist/07f3cef2-92e4-4bfa-852c-565efcd345fc.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 0x5f96135d35b30b20a961bcfae7900904533ea2ee00fb4f71acbcbba2153e4cb4. 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/QZHN42404361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2be903b3b285a0bbf92046faaab1271a70ba2df0bf1f954452d526cf6304b6b. 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/QZTAY2452554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd31e13b3bfdf5326281846e250ca35b6046c2fe22fd8a8cbddcc8ceb1606cc. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTB82411194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab673a65ad7c8b0cab81e3416174cfdb889b52f273351099b7b928f77a37d5c1. 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/QZTBF2403993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7c90b555f9264f8bd59093edfce3a0be8807a3daa007239e83c2b8b1c0531e. 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/QZZ762433133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ae081b5414e41595a44b2e4d6364c29b41ed21a5c9748beedb0d7e26c812d3. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZZ7R2447806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4504bd3c13a418d789aa3c4d33b73fe7b5c249923f2c3ee05b2260889f26d57e. 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/QZFZ62535563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c653e346da721bfe708ccb666d16d52de6920bf1c517815b2b9970b00c6091. 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/QZK6H2573549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0af2290e6e37bd6e279bbbc0536367fe69a2ac8bae86d81c2536a52d0fc391. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6H2573550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5166449ea6e6e1127afa66a2648160bfa2d5dfc8c151bf6524ff22022e3799d5. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6H2573551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8763077d41702d7c700c4650944ee8951578dae7314e07540fb981ef181cb89. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZK6H2573553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82b07a7717285f7bec86693b4b07e3af2483968e656b908f762a3e55ed0c957. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/CH7812536741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9a605c5d049b4ac56e70b17741d3f2042c3e076ec13e58e0c5f6394fe7cffd. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/CH7812536744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d2f96e316104c7b348e5bca4247070d7e1e13267defc6a5d81f8c8a5550d0f. 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/CH7812536745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8800400f3c3585e03e30ce311022954d88b260631c75524ebe34ef8ab0eb11. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/CH7812536747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd1af51fde34a7abeef0b4d8dcf18987b9751696ee0c86bd07062c86873f4f1. 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/CH7812536748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b429e6b33b8bb0513e0aef225f9e734aaa79aefefb6d901d305769acd1e780. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CH7812536749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a9f1e09b8b1a775222b50ab46d65a1fee9be8ac76cb0f929350eef4c46c724. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CH7812536750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b16ac264ff46f212176ce97b81f67f2fd0e1c495eda29f4102a6d8b8884332. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/CH7812536751.