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 0x615ee0710be7cc1b8c2b5d829432195ef25f1607a6333c6d9e51032c090cbbe7. 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/73b5ecee-c28e-4da5-9baa-25d862b3483f.json and https://artists.proofprofile.net/proofs/artist/73b5ecee-c28e-4da5-9baa-25d862b3483f.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 0x39d6d70f0fbe9d8be7a9def339dc9927e04d17cc2559521f3de9ab7ffdb93975. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CHC262200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca93097f5dbd86817b16d259e33ea3617b34f2b04c86cf265ca8c04cb116463. 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/CHC262000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a13891eb6057de36f2e47f4ceddcf0423dc3a9b038dc39df943d30cc2fdf52. 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/CHC262000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b75b93cecc3a41e9b649f2da061147c4d8969b3d732cb6a285ddb80b3a7bc3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CH4742300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592a50576799476b6e7aa16f92b8966e20ce4c0a6b9a77c51fdbf8c860101f7e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CHC262100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f085d1bba6e0635482e334372e52dad60a67e667b84900b927e71fae04dd464. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CHC262100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062234b958d813af4de0802cbaffdc98e6ab97c186fdd17f308a2481bd922157. 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/FRX281743975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16af544a98de49e76a0978391041941de93316bac5a1aad37f46987f5519edc4. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FRX281743976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3701d91bfe3b94eb5c78e2a42b62b19057d7fd07291cf396b598cc614d6b12a4. 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/FRX281743977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ef1257973916ac88d9e7fcc66159fea92adeb6cff503043364867d7a2796e8. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/FRX281743978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfa2d48d1e1cd540463172570d23645f9ebf32e096b3cbcdac9f4fe2b3006d3. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/FRX281743979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aebe4255958e54f10b9af030a3821edf24fca89d45a68e5e2832156c17cbb5. 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/FRX281743980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445dddc65a49d5edc0506ef4883683468bda328a9a9185ffbadef3964f89e41b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX281743981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f120e6bdcf5420584a2d740c494e26ef46c961964f112cdb2381bf64b7dde8. 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/FRX281743982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1a624b4ee13dab6e3fdf73893ab27deb402cd7a73abba7666f0cbdb7a97079. 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/FRX281743983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38271ffdd05d224ceeff49a2100d4dac334c50907a3231d4808b80480afef8d. 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/FRX281743984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e59606475cdac55c42fd420ebc18b8b32e60a13534bea39647c9bb5a27e5da. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FRX281743985.