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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2697c966ccb0262b001157fcb64cd98fefce0ed2a2938597106b7d354551f685. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08e3e6b6-fdf4-4f18-89c5-0fee6c042dc1.json and https://artists.proofprofile.net/proofs/artist/08e3e6b6-fdf4-4f18-89c5-0fee6c042dc1.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0cee4cbe1acd481fb9bb4c8072911237c2398c5ed0ebe3e566854f6f4768fe. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T17:46:43Z), 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/UKACT2010170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee26f39d2c32262ce77b73e275523ac89287c0ab7e863cae67df6d04520ebb30. 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/GBKQU2191242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2876fbad1ae076c19a71d31ea71ef0664e92c5dc3d6ac3eea8015ff339a03c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/US83Z2148343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b77f9df319b06800c2326a6633385f0739c7bf40225f95df8e0821b28c99537. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US83Z2219535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c812a4056a6d1da0ecf06df9a3c8378600ae9ef89249c97113d84944939c40. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/US83Z2338225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2467f27a37dc431c37bdfc63f09af65062b9055b1d71bda0ca348293d2c04b. 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/US83Z2345187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90767a6ffef4eecc828a96a990ad56995fd4ed582900f47be8d6a46953bfb9f2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US83Z2465816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b148f33efd028551d947d84d39a261c7a29417b3e82cdc1d602c21f62fa8dd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:15:45Z), 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/US83Z2485060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8dc795ad7a2d392c49b46375fef7464bec419f1f19b3e61feab715ee4a24e0d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US83Z2496834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b038de4d07760e8ab2aeda85b69e75be834cf8a5cb7fa6f9fdcb27acc698e0e. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/US83Z2404047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6304dd89ccc076db56217259385ee1b6a7ca8eab2dfe5afa2c940ba7c9036c4a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/US83Z2512482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2876fbad1ae076c19a71d31ea71ef0664e92c5dc3d6ac3eea8015ff339a03c. 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/US83Z2148343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6801885d9828cfc12fea2fac498220c3ff0c003b97093dc76568966f48377539. 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/CA5KR2177023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4546349dc5f17c8f9f2587a012553b49c51325ffcef89167718b6f00ae2a9f7f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBKQU1856474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c7172dad81037a4d062fa3f93eff8d4691f0545e4051b27f646b0a9a5cf1d2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US83Z2219536.
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