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 0xaad383f38d38538d13ff0b06ad8b042f36245b27338f9a164248fde2e40a4a44. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5a11c37-0179-4808-b7e2-8669e3805208.json and https://artists.proofprofile.net/proofs/artist/c5a11c37-0179-4808-b7e2-8669e3805208.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 0x8ceb774b7b5f99a66f932342ac3108d283d4ef58eb2b05e6f6a0102871ae21d3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIJ7H1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8d3c5aacb47234d055c0387657d21bd50dd8ec208ea29eb0550727b3c825c2. 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/FIJ7H1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dae3192787d0fa2a27931864fbfebf3785d71c23540508928f8e366e739cb05. 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/FIJ7H1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bb3e330010ff3b4fff74f80a7d3166bc9f26d2332e84bffd58798c3a13a690. 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/FIJ7H1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21637c7961d7ea527691cd797702ba4056db50e853ce819142eefd991bc6bd9. 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/FIJ7H1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2c315f6b90483b7649e6b847c468641790ade05e7397276a02495dbe6b5331. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/FIJ7H1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a0dae4e472745d158e2424ee73ab1d84a461adb94656b5a9fee39be014eae0. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FIJ7H1900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f567b7314e44fa5fbb631d23d0e077a5a174a08ac7b6c04a6984f2990287d2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FIJ7H1900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8aa24e8ec6d324026f3b4576faae6f0c1e1c63cca7536d13af3a279bf614f8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FIJ7H1900033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024f93d7a7b2ceb9091cb5d3488315aca5a48232557c2146570479b0491fd153. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FIJ7H1900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7012ae75633dc6ff15cc24915f7ee86515bec2ce0fbb30d3249c36e7a41112a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FIJ7H1900037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ac74c0799f4c0bf441354dc542c15cb035458573e747ce22bca74436a0dc6f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FIJ7H1900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde308edcaf0513084c545e8295843d49466a45027f985a537930ccc6fc46755b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FIJ7H1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56938c9c5eb429770319e352e0530bb68fc882bbf25344c418d2a934245d5d82. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FIJ7H1900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bd6f5e5dd63a0a0926b56a7f0546f83e3b5cac6b78c1fe1b611af16e2a1df5. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/FIJ7H1900051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac01111f7fbc97cd4da193066d9a168523ca38dfa387adcf426d5608e75e210. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FIJ7H1900053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337bdc1ae96511fc5600a49f86eb7bb1343fce8c2a432f1906b7dcbf5b841d13. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/FIJ7H1900061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf924fc7c0ccb3bad52aa21130500ee7b6bfa619a5d248a4fd262f102b3190344. 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/FIJ7H1900063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479bd27b79cf98c376f177141c95368444f41e17c8c996c8607747d46db9935b. 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/FIJ7H1900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c08478ca67a94dd566e8119a102cbd30900e50b472d81592a6bdcb82d5846a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FIJ7H1900067.