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 0x13d56d230b9ed32623bbd360f945e2a10be415126d4202e06b1a0b94839f5a2a. 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/16854a86-35c8-49a7-8e41-c42a5f677785.json and https://artists.proofprofile.net/proofs/artist/16854a86-35c8-49a7-8e41-c42a5f677785.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 0x55a9e9c16efc9235e8a152a2d60966986f844f544d009d099bb5523b7a6a4367. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USJ3V1265393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48c04a1b7e5ac37df43f1a32a057cf9c814f7dd0330fa61f1c142262dc4cb0d. 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/USJ3V1265394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7ef07710f6b60a14aae2dccdb002dcaa1c904ab27a87f48f020cb3a6e817a6. 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/USJ3V1265395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35233d7f2c25ba59080b280d1d0ccd86da9ac81174ed0c1a601d02754bfa7f53. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/USJ3V1265396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb142a79be12f9589c2b4e25e11bb257baadaed943d92a29facc9b5de9fb3135. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USJ3V1265398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b15303e739dcfc813f1d8791caf8eb550a3b0f49871b3fab543afcbe0f3722. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USJ3V1265399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fba38ffaf15fe841858e4f1b00a82db4f0aa5b4ed894f5eba7bdcc974c0427. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USJ3V1265401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8f54900574c50aa601777043d26bb0edf527d140b18f38bac0e9da9a7a46c9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USJ3V1265299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f275c9fa8c33d7c3d900fb7520e0c2943710345dec9aebba9c552963a153cc. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USJ3V1265301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0bf0330da5797215a58ef3938c48a3a47646dd0676ed9fe053de4cc44bf9153. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USJ3V1265302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901b1d1d31c63c7f0e25776e83a91d5f5c8f8d3066ecdec8674b97ff91e239c6. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/USJ3V1265305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eaabc2a28134b4e43a9ac86e3bf5e0769d10d4b8d3b2d2a7b3d13faaf6e88ed. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USJ3V1265574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5603dce36c40bca137fa80c8b23c7ef16606b067496cd66a220f2a78248b18e. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/USJ3V1265575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8fd5df9b364fc809e006839aef7371fc246b87770e398460d8c967c32af9518. 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/USJ3V1265576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630e02c42bd237270ba8a8dc05ec9615419407beb223b6c3861cda08dc864451. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USJ3V1265578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3768a5196ece17a4bb140ab04cbea0b914e55bbe3a365bd1c7e286c17c50f096. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/USJ3V1265579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde0a70fb0fe88f27d283daebc7311c6e8ae4d43eb8152c9bb84d94f1eb3c2101. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USJ3V1265580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1899108875b99834a9e3e10b80cf54ecb2412351ec72ef59f97b2a98b7a421. 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/USJ3V1265581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4986066129c6831df43333cca523947d0ca1e130f8fe24aba6130c204b9f71. 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/QM9AA1417874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd84e8d78439aa26d6bc4df4bc3d49b6bcf5d98b080e8fc5cd9f33083b661f2. 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/QM9AA1417875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ac81255cad5cc989e23605cc56cee68f12f6511288cc634396002d44cbd8a2. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QM9AA1417876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599fcb8682ee8fb9417d32088dcb9aa011b7bdeab0efd5be601bedf64aa87f7f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM9AA1417878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75989bd616cf810d588fc5c2aa9e5b33398547ef0f1c27e2545fa17ab91ff9ba. 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/QM9AA1417879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71769950109340abffc20598b91da15107d473b4270b1b48bc98528e21c1e558. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USJ3V2048279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cb220b0addfa231b155fea6b4d6d53880ab6d945541bce28cffce489979b0b. 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/TCABO1385824.