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 0x84d761842a2c836103f18abb4da0751a882026132b9a3f75921802b0545a802c. 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/217e8e93-4bad-4573-bd76-711ac244212e.json and https://artists.proofprofile.net/proofs/artist/217e8e93-4bad-4573-bd76-711ac244212e.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 0x11d6fd7e251ace524f6d94b4cb00bdb1bf259a23142aabc740991502df59c136. 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/USHM81738561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d98be98fc7a6b1da5e05b340ee6e53ab0948b759724aec63125c868de8a98cc. 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/USL4Q1757363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3373fe3f8fc20f4e31e41af3cd1b1c4c20b4fcf2b14474fa3e36fac41116bb00. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/FILOV2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552688b87e0f3cbb31fd98e7d7018767be7dccafe62c144c17425f2f0b437bc7. 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/FILOV2000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c5070d733f88ac9f59f35ce06da5e18b1657b47ab1d37bc1c8bee76557f052. 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/FILOV2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c113cc3ac178149b512e369f9ae9eaaf482b69a02eaad55c94b040d521cb4b. 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/FILOV2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda36e7c5bf380ae4b0de4f4f16adfb7900565a88af73e033a7363d0df7d6e0c. 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/FILOV2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4887f9d93c6a418a511a0335b7e9642a9539b7d967793157df9207468907b502. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/FILOV2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0b13ce79ada59782410e11cf529157ab3b6703a79167f71e15237f9a28a5fe. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/FILOV2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45a02687f8b7ad5b56929a3c9fcf7eb102889336acc18b4598ae1f60b6ad347. 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/FILOV2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8121e2f475fb84c73b2c489098eb93fd94d98f485e6619a2e2eb23f830bcce6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FILOV2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8235ec7a32bdf3f2b20bd2526db33cb5f1061f55edec5d1cc134b22d42220559. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/FILOV2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa149bd9516749092731dc89b2f2aa64d9c7f941194c7e5e209ed12608d0d9b2c. 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/FILOV2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692eeb417a9b7d2e6de16d022db3adbba81286857a85a7dd40ce4307f3dce63b. 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/FILOV2200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fbdbf1e9681e716e0ebc00233d2e2e560ec1cddbc13bc8a69acd5fbd28e266. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FIUM72300132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f64a96fd092c9d4193050b0eadf1700c388399ca15838e9973d88880799c24. 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/FIUM72300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf214d1e8bac485649004a4d775d212b4451d4989d8ce7cd1eec2dad6ea3cf9c2. 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/FIUM72300147.