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 0x8797617257a554b948a6c382df4779badcdc19bee66a2f55703e7b175867fd45. 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/2143c191-58f8-4174-96a6-2ba77ec54fef.json and https://artists.proofprofile.net/proofs/artist/2143c191-58f8-4174-96a6-2ba77ec54fef.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 0x5ec330035691c7116db11c506c24798e1cba275e7385d633bba419945a9f8847. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCAEB1925371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a718a25f5f916822a7a5d26ab5e3cdf80cd27df19d7e9a05395311a4faf747. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAES2034940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fc98a9800c6841fdd796a1e75313eb37004420f5d27f83a1b9220c238c6abd. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T22:46:26Z), 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/TCAES2035017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ba5e58e4e50f29fcb837ced1e435b0444de5d6f279071a750bff3396ba60e1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAES2035036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82998997aa6d212aba3d0579f03d375d2529d48ce92fc847ccaed5aabb9f6769. 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/TCAES2035039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9ecbbafc9ad9abb9ea618699e19019045fb6f2d66b7121b2138fc8b5da128d. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAIJ2428468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7634c4c99d95b1dbe8aa0b66bae4a575894e013ed8cdd18fc2f0d9bd591617. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:30:58Z), 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/TCAJF2579615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0a7c1a216f1a41e32f533d0e4932a5ae76a3e0f0063463a894de8ef98a237a. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:42:33Z), 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/TCAJZ2567915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f288665b9292aa259fcf79a590540c4794c97a0453694a78bc4207467652b87. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT65Z2545897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695041969fe2d825cefe85fe1680b3233a6b0aa9536b08c9f88808377a8c7311. 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/CZAC91800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87ed0b8d7e7a05275dcb768e66f0874ef2abe8b9beb81e160f54d30fa762f5b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZAC91800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcace1e35ce075bd95787d4dbc02054509762a965c782f0dc5a8094c7de7c610d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SKG151900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4c016d5cf8d0c9b9686317515aec5548dbe27fb9dd942f56eaace6fa54fd5f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SKG671400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445462222b016281e4f9e9131dc162208ba66eed2f020854a0b8db3ca2d8cedf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SKG671400217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4e095f32db443c3ff40ea9c0ce3b7a67bb1497b81539fab97296b22c81570f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SKG151700404.