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 0x987c5810bd7da23d52489b3930c231906e2d0719c6253199219ba36104093e44. 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/b653c797-c1ae-4c98-9c3c-c84026746358.json and https://artists.proofprofile.net/proofs/artist/b653c797-c1ae-4c98-9c3c-c84026746358.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 0x498d4d32e63ef46354a0c06da5f1d23658ee86d92eb6b7f70338d9f939a55f3b. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZFYX2192403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddba9372b6b00577d45c6b811dfed9c00e04e4c6062a001986bc862ef5aa500. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZES52172969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d10e887bea9ddb3e9d3df8e9ac5438fdb649e7b5cece85f590199fac1dcb0f. 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/QZES52172971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84648cce9f0c5c099b4710be5f72a719c662e381c95274feed581a72f5b46f39. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES52172972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282b8e7889f95b74f4b860e9b6217ff3a4ac10fb8559579e4f4bbcf2fc500b40. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/ITOL62300251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799e0fe812a9a59c7593107e339751d118711f45210b42a38c0c7b413d4fd05d. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/ITOL62300264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce733aba5f6a9924ab7cac6b1b283c356c4ef555b951349a8699009795abddac. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/ITOL62400278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837d1349a575eb3d0510a05fc85eaf2bf607b8d8b8f272eeee6540f7f2b1c136. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/ITOL62400294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c8704ee68ffccb576e2f0157c80f4d0b3bb6d073a491c4c42d2430781afd33. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ITOL62400560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c8704ee68ffccb576e2f0157c80f4d0b3bb6d073a491c4c42d2430781afd33. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ITOL62400560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf9f31119dc7d7b7ebc15b9aa1694383d168f428e488b99a613aaa041e2640d. 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/QZK6H2266468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209809f97810d7135d88edd7cf6427c9a2c4cf1b5423d83fbbfe5680f0b20eca. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/ITZRF2400134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd38ba7991f7ca8ed673a07e75dda1733618595575c4ea3de73c86fe0020d6ef. 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/ITZRF2400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209809f97810d7135d88edd7cf6427c9a2c4cf1b5423d83fbbfe5680f0b20eca. 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/ITZRF2400134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd38ba7991f7ca8ed673a07e75dda1733618595575c4ea3de73c86fe0020d6ef. 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/ITZRF2400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2e8ba668416e285c4f91b37c8dcab3ae7103c9949c479d1e5e282fba14a177. 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/ITOL62400357.