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 0x8ca30ed00e80dd08b642992d4a38539e7d846317516876dde6e5e963ebea8e4f. 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/47172fe4-5a78-4d5d-a15b-7e2b904327d8.json and https://artists.proofprofile.net/proofs/artist/47172fe4-5a78-4d5d-a15b-7e2b904327d8.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 0x8cf6b05ee4e34bd80097b87b2a3feb018c63ef34f3daa80e7291d74852d78b27. 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/US23K1000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8150b1289243762276ed4d4b9c68b0fceef999b4e0a72de8de16fdfa0e3bf0b4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US23K1000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd8b48a70cf94b5d278aa4d15c5d5f91f26eada079b8a8d724af170a2287b3f. 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/TCABW1442483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a584deae8969cc34f268256947a127bd699eab5c46f7092add2d1bf0678e1c. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NOYZK1801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fa28e50d33f821cb5b77fc79118f088e402c26b9f6145bb62832dcf0ab2729. 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/QZTB62367099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc86e495b9ec6adc53fc7734bbf04c5a998a35a936715d1de70089dc8a33584. 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/QZTB62367100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7884dc0a9127a13e4be515f7a88db7cbdb45aa72006280dfba65efa3f96b2b. 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/QZTB62367101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb42962c8450136fb65e9b96c39d0f94be5f0d5c26919dcf38847032ab9befc9. 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/QZTB62367102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636e938103994a741b7321d601fda97fcffb3df9132f8f5924d680291bb30f1b. 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/QZTB62367103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b380c41766cbd158f2ede9896025fb7e77e25041d6e1f59dc6d5c720fa8694. 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/QZTB62367104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14af6bc27d90ceca08e2f658086f7c9de5f28810165d111985dc5f4faf62facb. 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/QZTB62367105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb65d705d46a4a8b2e9074ba32de00bb4545ce0833e219731f4a4d9968af568b6. 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/QZTB62367107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2c1df2c8a39e9330905f7a5c9d672836d55a4e335bd0a6cf4551d58c823bec. 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/NOYZK2401020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdd2982e8598218997d4f976c5f29af77040f9952037693eb5610528fd9bed2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOYZK2402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e91e6fa6aeef1fa89d6b164320ff0c57bba07789fef872200f33f050c1d8ca. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NOYZK2402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9fb65ba1f20b3fa2ae878eff28a35d13b84670b77b87e3b1cd139700c118e6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NOYZK2402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ce10d78f7a943457834a7764ca1378e3c3f55af198f7e52480eba2ee231b00. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/NOYZK2402060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89deffc7cffba2e1796ee1697e6e3d13f4838827723cb627417333a5ebf7c2e3. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZNWZ2431937.