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 0xc515f554945393d5405b8b97964c8837d55f2c530e6e62ab4b90e8c03eae1692. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16e71c72-577f-47e5-a85c-cdef4e0d0d39.json and https://artists.proofprofile.net/proofs/artist/16e71c72-577f-47e5-a85c-cdef4e0d0d39.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 0x8b82ba0b6f247800aab201404e318df0a3e2971867014dca00fb10db2153021f. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZNWY2262397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a778c9d774d5d1d97c01e20cd173e063ea0912cd7f8c7662bec624fcf1cebd1. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZNWY2262398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425380becfd853eefd1b1ca0fceb56a194cb628cd4dbb9b209d1b0d8eacc6b3e. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T23:22:46Z), 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/QZNWY2262399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e942fb9be168f3145aaa3db0c8dd22424c129911e8e82f47cdb8e6c234ca52. 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/QZNWY2262400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f1c01eff2243f4297eebcb5e1a42f33fe62cba466494c5db0f4e56717da8de. 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/QZNWY2262402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0650a149798a74a684bc518840c83f08c1ed9ad417f33e35edd679559de32e1. 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/QZNWY2262403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8adea56a36d83fe233bc15d65b09c19d5045bb26d11f6f298432ca5e874291. 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/QZNWY2262405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1cc17bcbab5b0d422f59b669b6561e278e46b017dd72af4e42d93b0616918b. 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/QZTB62249079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeec34f2104ab8a3d5395d3c22b97105d7f60c559b5043a80e52707677c38780. 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/QZMEQ2473430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1926c7f0d1d43b10bd373c8af7319ca5971bf6006e3a32eab4cc3a7068447393. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZMEQ2473436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89412af6a94cc55f5dfd5afe702fa97d9782ddf309fcd0e47d694dfdaced5a8b. 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/QZMEQ2473437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c993d914d1a66659dc4dc194f32f5a390d5f974644310e9f279528f330175. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZWFV2482232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76194c3329b0f4c9b78203f26db40d35d1c72a9698d60606957f48051eb15573. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWFV2482234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9221401178ce070b66e9e669736b96487ec1084d4c650fcf0561ad0b77e6b47f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:21:44Z), 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/QZWFV2482236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa889c4e463117a6466c1c33c1d51a5759e8082beb82a743a2db8292fa3b14d9f. 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/QZWFV2482238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6b2a2fcc6f3c6a54b45e80053fb96f8728d4fc0aad1ffb8f47ba7896445751. 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/QZWFV2482239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04961488d9b6f27d07cf56e6cc52c4e55daca6ebf4a116ed731439f88c3e38bc. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZWFV2482241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f07efd83474cdf7644b209f84eb2fa53b6dfa0b4979fa89e21521d47795cb3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:52:48Z), 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/QZRP52589770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f5ff4db67002d4e1878c068ccc5c15b75cf1d38f3e7b6a6846ab26a11a21a0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFV2538228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53be5657e995d938c394cc023bb564440723e1b5482c6d66845676fd66076ec. 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/QZZ772561020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c9340c6b8014a8108ec22976c95662a43ec5ef6b91338a2ec347a0f8a7b301. 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/QT3F82518034.