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 0x031505b16d0c5ea2249c9454d99d9ad20e7663a2c1d3cb44b3564ecca4657375. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c774a3d7-f167-407a-a956-b3ca32a857f2.json and https://artists.proofprofile.net/proofs/artist/c774a3d7-f167-407a-a956-b3ca32a857f2.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 0x026ca0fb972ca4be95aad8753da84eb699e5a1832afc8bc39950b46a0588ecb0. 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/NOFGH1441040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325970aea5888edccc7fd4e8abc56bd14663af182fe73579642494d9658988a5. 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/NOFGH1808020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcb153f32282c23f65e8dba1a87248df3bb611935267b87850c7196ed8c40f9. 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/NOFGH1661020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69586c87b9cd108ec30e1cb4b817af1a814cad0e7ef7bd8aaa323ca84c95782b. 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/NOFGH1661050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9878105b3e453b23c3268e71faffde893b768cbb8fbcd49c3780df161e5097f7. 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/NOFGH1661010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcb153f32282c23f65e8dba1a87248df3bb611935267b87850c7196ed8c40f9. 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/NOFGH1661020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4404f1410e59fda5abf477aa80aa1c484a923c914590afecdee03ef418a20874. 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/NOFGH1661030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d73d86e56285ae386d11dd456f0ec3769e9fcc24aa04925ed0b62413befa076. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/NOFGH1661040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69586c87b9cd108ec30e1cb4b817af1a814cad0e7ef7bd8aaa323ca84c95782b. 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/NOFGH1661050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c84af86950efe605fabec7d09ba1d08f41e59a75bc9232f2d500082c546f6b5. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NOFGH1661060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1750427e08c8c56616565a73e948d2f35a55393e51a2120b17d922787b69bb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NOFGH1441010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e91cf6bfc2ec4dc2847208ed4388f5f49f9b80c7caca020eb43260f445be56a. 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/NOFGH1441020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2a3022de7e53a55d81d63dc49020cd6a9aa9fe95e8d0d898f83276d62b8916. 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/NOFGH1441030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026ca0fb972ca4be95aad8753da84eb699e5a1832afc8bc39950b46a0588ecb0. 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/NOFGH1441040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcead6c733812627ea9e9788eefce20cd151de01c1a154167cf76087e374f3a9. 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/NOFGH1441050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03be64a8d404af8630e6bc0d0cbfbe44c2484e6e81dd53fbe507f5e6e13d1427. 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/NOFGH1441060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87eda3ae05b5fa1e8cc80bed4b9a5e2583db01e63f91d276f5f8e4a469113227. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NOFGH1441070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6dea96254b21593b5e86fc73e71bc0f2c5cddf06539f8ddf3eb31adbd3c114. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NOFGH1808010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c52f996c30b55ace7135dc53e402d80fbc27b9a90051b60ce862a2a14b0f95. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NOFGH1808030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde45f9dae49566b40c02cae3bb19373ebc2023736aac0b95b8e9512311c24f2d. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NOFGH1808040.