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 0x4e295cdaf89a802aad4c8004df7382aa3b20eacc1845bec2eeb7c05ff51e45cd. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97652b01-0114-4f9e-a1ca-520472b4f6fe.json and https://artists.proofprofile.net/proofs/artist/97652b01-0114-4f9e-a1ca-520472b4f6fe.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 0x93e7a9057ba930a2ba65326126df6363b24461b61d69b6dd5ec340d108191dfb. 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/HUA182224101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98764c4fa2d315515cfc432ba11acf11137ed0473c0573cf7f3f02d2ae6dbd20. 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/HUC811500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8356963431b768e622e42575233edcb4962954d46d2069959e6a2324201b1254. 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/HUC811500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb71dd95c49b2c8a051a7eb89b8799e41a66b9c124305d90cc0246d94c4db5ebf. 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/HUC811500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf96d1b7726c1fa224f773dd2bb2fafe9dbb5117a8b492807471284d34e95ae7. 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/HUC811500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58218f7b1d5841e627e50fbc415a7086e1aebfe676c5f8639eca2baa75649ae9. 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/HUC811500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2db626c5d66a53339b68fe133ec70fd9e779e9f1f4bd9d2fa0970e65e1fdef7. 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/HUC811500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921a8de6422fc57ece3308597ef82a723faffd63e75c93bc33843620344a3765. 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/HUC811500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393993d21c3ed12fc671744cbf9f0bd650ba9f3318a588cf52ea3b349f753a9f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HUC811400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd26fe72492faffbc4539019638a8bf7d674dd325d339cb1807a9b8e71102f4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HUC811400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f6e8dee947204c7a656440a27189900199dd35218ad525148c04823cdfd25f. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/HUC811500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31919ad3283aa45a1a25306f3c879cf0b334b0e78202ae8f9208aab22b86597. 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/HUC811500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb373380d91312c3162a3b0fb226a4f2bfbec620de2811bee1617817b15a7d1. 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/HUC811500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1b85eb7f732f1310a16202ca1f7e69aa147da3f3da27313363a2615b1ac66e. 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/HUC811500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4f11e9de53a88be0e003734991a195fcd5fcc4d1b5e1bdd1691362259f2cde. 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/HUC811500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa64b03bed92b58a7466813fbef5de351ea4d9102477bcaf843b8aa00b441c7fa. 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/FR2X41604737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e7a9057ba930a2ba65326126df6363b24461b61d69b6dd5ec340d108191dfb. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/HUA182224101.