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 0x5bf52d38050de4c05926687944550891aa21f9edfc821149c68c05cadc747188. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/85fc5854-5318-44a4-8326-c3f4387058fe.json and https://artists.proofprofile.net/proofs/artist/85fc5854-5318-44a4-8326-c3f4387058fe.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 0x80c19319b39a4f1e4aa7cc4ed1dccce33ab199d405dca960ed43643bbf9c2c5b. 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/DGA0H2304318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50c94671c4303e70bdd5ca06ab0c31b1b8790ce8122fa6aa529371fd7f846b3. 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/DGA0H2304319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff4e7f8f0206b6462f4682d841aa8e8bca8c858ba26a47244bcbf455dcd62bd. 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/US7VG2314511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbcac42426067f9875a0ef87ef5decb7b5eafa68d3b01f95a57e38f2284185f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US7VG2314512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4790ee4a95c41cf29363f4900b12443760e43ee1d70d37782a679f35a578659c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZQAY2423629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9d0983c9b39960e24bf178be07a4e5334b5c9c55dd31762966d87754c4a6d7. 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/QZQAY2423624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd439362b4c494a87fa19139fc13693de6a61fc47ed4a7edd29a8a72a01f80e0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZQAY2489552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7597a913c82c27f5c1803fa5190f930d346b216ee139fa4a77eb0a811d34f32. 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/QZQAY2431887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e2e98525429272ee66daf6bf2001d51caebc62567aab4d1bf2099758869a8f. 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/QZQAY2487259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a45c4208537c8470cc3d623c3a29b9622965e71289acb64c644b17a91ec890. 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/QZQAY2420454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5310fabe73177447bb12ce62b4838845effd90c914f4f3321da783be0cad95. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZQAY2440007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e6dccadc08de0f788579dd2e793615166d65f663939036c63ea27b7b68937d. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZQAY2481647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a05953c1463b1e56aa1ec50bf6075ac6fa75076cce3c3f42914b412ee16dc9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZQAY2419375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed98f354f1bce66814488840c668e5cf64bde3413d5e4ef9636f28e569a30a0. 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/QZQAY2426478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf8c9d9c2846a0bb7d6ade8535fe87f5b1c17b0c3abaf74433892b7c3009e40. 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/QZQAY2498449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b726e520fb8899b36595732c702c59189e7515bc2b3077ff16a457671eb8a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZQAY2463011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7a85bc1962ae133725dfc3414fd38612e8f921b963953297fd8fc5d07859ca. 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/QZQAY2437097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5774c532179babb88b14a19c95cb5fb1998998fd7d4f5b6c1b0c8a8ca8063a6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBLLT2350287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104736a3f790c690dcd15c932a80428f6ee2f0b3299eb2c38dc46bae453e4821. 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/GBLLT2316767.