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 0x659f7cf63f2c5578cd0127d524e71b2c48b6a22c6ee25727134b7de13cccaacb. 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/03e286ae-829d-4335-a8a5-09760e0236e8.json and https://artists.proofprofile.net/proofs/artist/03e286ae-829d-4335-a8a5-09760e0236e8.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 0xc5e35567e08a223d660770f6eb23c00ca85fe9148656b8169f45df229987d082. 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/USCGJ1977221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6436417e43b38b107e263f98c902f8b76542f6cb064d33224ef17f121caaaf59. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USCGJ1977223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d317a6e19da096e30a25ec2eeeade3cd5b6102579516d2533f2bec35a9b534. 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/USCGJ1977225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec658f95bbfc77158d16441b752cc036cabb2561aa34c9097abd64bc0fc49d0. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USCGJ2133401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1934c8ad0ff267130c6bffd227ab8c3dc21f0d243312d182d5a3bcec861a6e. 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/USL4R2120124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73aa3d27a0aa76f8d06ef62212d81ea30eef44c700f90a8111164f4544f4206. 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/USL4R2120125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7047f3725d4e7dc6dda66a4fb0876c87b32883f976c233c721a7f45ad4d14c2f. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/USL4R2120126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b1c918b652be754b3014d34f0626904d675453dd1637bca24d75749622d4f6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4R2120127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b9fd33d92cf2a67e98ad92d5aaece9ca3376df48ff796ba03a162c026f9ebe. 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/USL4R2120128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c929f5f7e85f9da874c6773a0c4c24d4054c9dc867e68f7f2e3b15e2312efe2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USL4R2120129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c2bd48fff36370df27aab90a23815c431487cb05e7194b803aea1a756a21ad. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2120130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c75cfd571bec716a44c85aec1156d3da11b70f64f48f90ff3cc3530dbc41d06. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USL4R2120131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a169ddfcce64a28f5f51fddb3f6c8f44836d0a2c542e21a9ae9eb665548e4e. 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/USL4R2120132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e6a9e16ab8d235aa8343b40f8f714fb422bd9f469bc11696c217c7235561f0. 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/USL4R2120133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b023b61d646c03bad80ea50f1f43ed75b8f33092c89cc33f2e4962fe6afd380. 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/QZTBF2384321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a88dc09c31c9837c8be711d8c251141e0acf2e9dd44b50159527ca21a3323a. 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/QZWFX2488607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ad41a94cb12b6600ac3dfef14b27b3cfb3de91061940120d859e08df22f3f2. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFX2488609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705641663b2e0e2d16ed0f13a2c25db8ced6d1212c6fe3148490ac39e43d9829. 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/QZWFX2488610.