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 0x58323bcb46110a83746efd11a552edf85bb4c16faaf183a07a7a3842348cad4c. 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/7be5f559-8f41-447a-86c8-1eb1699d9739.json and https://artists.proofprofile.net/proofs/artist/7be5f559-8f41-447a-86c8-1eb1699d9739.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 0xee7a60925ab3f2ea7ee51f22b3153cfde797fe017a086314c55f5a45ce40d620. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZPLR2022796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8b2b462fe47138693fe3990a7bf39042542e9fd8a93e6b4209d398673cdfb3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWU2327593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136a5877912041fe42629581f2a612da01e1c591c8af8ee2791d8467d1609ab9. 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/QZTAX2319369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678fdf34b38d4a2b6acc4d87d98bd81e91717ad3ee0584681692a8757f2d452e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBB2391699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34093927be7fc3d08a0e1ac0022fb24a2881bbbb2842a23f269055a5ffb1a8d0. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZTBF2370512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8eba82c04f09438dafc59f834f322b1f3b75943182dced07a2f4e9d871b303d. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZES82432560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657290146d59f1c611ab4a0df1b9686fda850392821f5168b672384daec01130. 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/QZES82432564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3314860fc72f2972815a385dafa97fce4904980e06f8e9415c78d9ceb595bd7f. 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/QZNWQ2475572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a082aa3221d5ebffed5911f84c91a21fe814a849e4b9543568eed9a60c2a472. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZNWX2458169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5642f9402f9524c6c1cd79e178db920ca995b4cf2a4d14e3e7fd6c5807463728. 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/NZPB12402703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7c5f2bf0b269d8bd6b976e135cac111fa265b9fa7e5131bacec240ddf7b065. 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/NZPB12402704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c678173fa3112075041b7a998045ce03ae1a72e150d5cdbc29c1ef57567ab3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NZPB12402705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1e9b2f8dfa5553ce22513a230929ac507ec9472f7dadfad3dc769f8e50a4ba. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NZPB12402706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbf33807cb1413d039dfa0140e7de9d200c3156e4fd0b46868413611977a3a8. 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/NZPB12402707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf371850db76233f64f50812de9a35faceee1ba98b29b40568cefda59ba776151. 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/NZPB12402708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ecc6803fab297ca758dfeb59e4645a4775cfe8374ac0e5574fd3362bc72ea11. 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/NZPB12500649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c60dc2ea5dad6bf762b5b942dea7e5d4147ef4f79c4fbd72b101e0a379ec73. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTBE2345030.