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 0x22210c9dbb255881945f783c846af0afd3212fab72e2ca9cc82784fca538f18d. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef425eef-b179-4ac1-855a-9cf5dc4b613e.json and https://artists.proofprofile.net/proofs/artist/ef425eef-b179-4ac1-855a-9cf5dc4b613e.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 0xc97be8d67c61108d3dcd17df62bc5f5eb46a3a0c2fe6f49556498e7bb0cca64f. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/US3DF2142743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9807939366f9afe688c5862337735ea30bf45b72b1b1d08688d34a80e08f538c. 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/US3DF2142744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43db169363ed71aed07ebd49ad1bc64c89d4ab0f44de2da20e72670c30d2c0ad. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US3DF2142746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31b3b5261576d5fcdc24755683f7c3deef415b205ed641a6270a01216836941. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US3DF2142747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70dabbcc68af8eecd005bfd3f043d878866de16b1270b16f0b5d0fd99e1f2cf. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US3DF2142748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08da8153f8d57c0c82c68d662f1e6215b0b7b0d5b56af97b43ed867d0e3a55ae. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/US3DF2142749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f97e1c9ed7c129f49158e486b8a5805bce4c4a17014cd42e1746e40d42fe15. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US3DF2142750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7b2a23a8fd23dd68dd6752a2b4372150ffa51c40a09bace1938cbd41bc926c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US3DF2142753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe517626eb8ccbfb3904607638b94b3eb2e4c7020a1cecf8d5e03de1acd6026dd. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/US3DF2147278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19ec94153c93aa2b07d108cc9d9b82be57dab1b23948a750fc7757ef908974e. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/US3DF2147280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc115a48e88f2079f5b8d3cb3afe05c26f02c1831788f7cb24ac983961aab74. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/US3DF2147281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf056630db77cd01fc9275b5e9babe8859ff072feceb862e747688e2c3698e5e1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/US3DF2147282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d7d64d771dc5c9120ef6ce372ec658020a9909cf31cf933091166d19520e96. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/US3DF2147283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe408cf45a88e1d8a32bc9d9393e3df38531bc2fc71951a97add42d32a5428671. 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/US3DF2147284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccbc3d6a394838d1bcbd7d9fe9b9bda4c5e296b6059f06d415e40b5c965a1a0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3DF2147286.