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 0xe663563e2d58edc121c7802f2dfc8eaf29f45b5f8e9bb50853f9529e9eedd6c6. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36f25134-3aef-43e2-98a0-5e1b29259c96.json and https://artists.proofprofile.net/proofs/artist/36f25134-3aef-43e2-98a0-5e1b29259c96.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 0x45f5bd00d6a508c0a758c58d050812dbaa3bd2025edad501a3963fd2c63624ed. 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/CNZ852411151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f36043be155eb168526f09630589215f5b177780de1e63c916833a2adbd30d5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CNZ852411152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x020bc51a17108c7c0b6ab7fecc8f86d6f64aae87d80a97a36ad95e245e9c8c14. 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/CNZ852411153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb6305bf1d0696424a0c1475072771fcfa35a3bae297dbcd1bba830bb3c5d08. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/CNZ852411154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37185e0346fcc6005a4571b43533ce48028790a684fd9306661cf92dd2f7a8c. 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/CNZ852411124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe192850975354e90437cffb74279a7a0dbc1a763f4c285dad249aef5e05c6113. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CNZ852409779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56910c882b5663157f6931374b27a8ba9eec02a627af299c561c79f1564d766. 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/CNZ852401169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6f70837293773955e5757854f333be3b6a692fab5ecae7ae336d04ec3be3e2. 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/CNZ852208690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424eff7751e71c0b7fb2fb2b67d5ede140f8ad0a104fe58585fdd6f18114bd75. 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/CNZ852208667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0a82bff01f149f71afbf2ebc67343299a94ae664e83a828c71db68c1030f2d. 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/CNZ852208697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3587e99d094bbd53fc4ce886b1a1bb0954b6eea642ba6741384b502024d2bf. 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/HKE022363497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3c715be48811571e4365941dea54174139e92f6654a564f6c4a6f384ef8030. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKE022363498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1a2d2d8a2c7d5191f3415e9b8abbbf9aecb2faf805ea1d9b947bd5a12e37fd. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKE022363499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec645379b288896fb5af28f10b5219b42689134a20efd66e32d0cb790709b97. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HKE022363500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662a4e138acc4c6ba92daa3723e0cd9afd20bded3ba4ec1780cfd6996bd2e609. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKE022363501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc15b36b49e94599838f961b87e7e7bfb019aa8c0c4863aec60677b07dc632c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKE022386943.