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 0x8e1294f5874cdafea3f1cb299b6d560093f1249430b22df220bb7b06be783cbc. 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/3cb1ce3a-1b4f-4789-88d0-5e3ec3cbc653.json and https://artists.proofprofile.net/proofs/artist/3cb1ce3a-1b4f-4789-88d0-5e3ec3cbc653.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 0xe316d94cc0657eac8dfca6c7dbc9481aa3c12f3718587e80c972b642e38f379a. 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/QZYYZ2400295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e792ca155adb10e1dc8fb8f702eb9afaf412953602ce00d0b74dae01ebe327. 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/QZYYZ2400297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00129a9f17dd412828982f4fe55bf08e4131ca93bcd3c94c8bd44e237c88cbd2. 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/QZYYZ2400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f9b7b7dbfa8c7b097357a37fd7606a942a2f169e808b242fbd407e93c19328. 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/QZYYZ2400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf63efba954c17e0c5c2806326978f4687c0636169a3381c5f9f9054bceb77fe. 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/QZYYZ2300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1cb2b06b5c405db1cc640e99969fa38dbbb7c7f7b50752d4da4d981b1f0808. 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/QZYYZ2300324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f85d09ef0b7a8d1690dc84bdd5687c4f123e26f6b8e94b886b28d07b489e611. 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/QZYYZ2300327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cb00030fce730d827b340af01bbeaeced3b73502675a8659b7a3c31596ed19. 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/QZYYZ2300182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930f7415b307481aa719ed17bc237d22907d636126c4af7c447385459f193b62. 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/NLRD52347650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e01ca6a90006c2c67b56900b5c7982463b710e857ebdd7329dafc0d939db5e2. 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/NLRD52347651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53dcc9de2191140533ced7eba352d14841b9011aafa6889197588aa8d983b2d3. 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/NLRD52347652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8ca0034fd689147a6e84f6b882fa8a3d3172ef17869a8c9db06b0a3e6dbf9f. 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/NLRD52347654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68022db911d5be163d7f143aae50ba44fee0541587d6e6989c40bc88efdc3bcd. 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/QZYYZ2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565d85d0b7d41243cab9e7557c6c2999d2f02598da56c8950b087a3b07d9a8a2. 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/NLRD52347644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e9a83a255c50154353c210ee3c14082669305728f33b7eec44ec543b33cc19. 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/NLRD52347647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7909f2fc293940f2a7acfe0919e791991d6edd62ff9bd81578fdfb7a5e2eb72a. 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/NLRD52347629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9cb75f24d8278c2463ff69ae67a4bb94e3b8d89e4818bd08090609afb44f43. 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/NLRD52347631.