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 0x40edf0b70df32f7767645276e8be64ad2c8cac5c1f2468a0425d59c517b15c67. 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/00f8b68c-6d26-40c1-a3bf-5cade39c9d86.json and https://artists.proofprofile.net/proofs/artist/00f8b68c-6d26-40c1-a3bf-5cade39c9d86.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 0x4a921cd65c52aceca1ac42933dfdf03bc172a39f3818245658ce96b37427f4dd. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/US78L1716201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bbeea9d8200da19af2f3ab65dec1ca82496930cbdbed410c56d5836f2badaa. 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/US78L1716205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91181050391e3b898268da30f1b5793bc1b0491f3d31ffbca05b35e3180a72f3. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/US78L1716208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160ffc7ad839f3ab88052a526fb62ff738a7d2431a982159198c832209cd4015. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/US78L1716210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db2bf6d0fe0ce9e95c351d534f3afecdcdf0ae2c4fab9ede13c286fc1d5b21a. 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/US78L1717501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74967f105acfba36e9ae6ee8724bf29b26e4ec8e8fb84f177bfc7e6ef83b2c62. 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/US78L2018906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3969738e7a377e4218d177cf1207531b8606399acb81f63410a80e4f531e1f8e. 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/US78L2018911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330155cb2f153fb8d5b583ff1bc389b4962432b5b6cc9496e7731d34b25ec78d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US78L2325201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdbf53d89ad12f615d295afa7c46316be4709c2e3c8c77554e1a0a2a7bb4150. 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/US78L2325202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51d0b3487481e796af4e7506368b38da4ebf405caa9cc29b356838484b396554. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:39:54Z), 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/US78L2325203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0c3f152c51dc9595b9c8fabf89121519c7818cb9cbfc6aaf3ca573feafb203. 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/US78L2325206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e1938a158f36183b543f290751d32cc50aa9e87952e5b0d9a50db1763204ac. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/US78L2325208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863e190a98990243d0e672248fb1a533dc1dff6332bccfa34634c8d0d8cd1c3f. 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/GBEXH2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76faa840e3a5a7c9cbf5763132fe56570707d4e6c0d6a9f93c7492f9c4eb78fc. 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/UKWNJ2100031.