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 0x6a4b50a048e888b6ecfad36cbd7b731b63ee1277209f9881cd25b35c5dbb41cf. 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/3724b6d2-a54b-458a-848a-d79df2ec62d4.json and https://artists.proofprofile.net/proofs/artist/3724b6d2-a54b-458a-848a-d79df2ec62d4.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 0xdba23e6c774752702c091ce8b7f1ccd8c37975c08a7bb384b784dc5cd0c4dae5. 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/DEMV91805568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ae16a30f89b221a758e74460eec416f740986e9a39a7c79a3230efb4634a1c. 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/DEMV91805569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc340d591cb39391c6aa3999f77b32cb55db255cdf6e42221aa5778bde446fa8b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/DEMV91805571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0803b5a7f73b489274c74fa78df266a889675e0469764a15ca5035aafc59161. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEMV91805574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47928abe1b95456eba9974f58cc1ffaaa2138892de4017e20df1b8b6441be5c. 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/DEMV91805576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcace9eaf4cd13d971e773d372b47657fb29a746f0ca75f73c24c13847ab43ac9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM21663092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa582e21b747d366d1f23e3d33cd06354eb3c62dbc42233a7f29b175306faf3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM21663093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88dcc191f105c51055106d7f3891cd28c0f81b8ff9c00e6083580616b6914131. 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/USHM21663097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621b707c4b5e582b0a625beebc1c7256c81877e6b3367ae346f2be1d22596371. 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/DEMV91805510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86ae288c0b70e7fa6dd86e498ae81a2cd35b4be4dc675d1d9541fb60ab81daa. 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/DEMV91805511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1923aea994732f0e9e1f16eef227b94ae901332970df2d467b0945a7eeb8d8. 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/DEMV91805512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6740ebf1840bcf453cd3e44262737a4b895a2177201d54811888f1a7a5b2825. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/DEMV91805513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca581d54ff9613195ac4997616a5db52d9f602282a0514dd5b8e52cc5863081. 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/DEMV91805514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9fd157ab9f5183339beaf850b15e9ff8042ac111a52ddae3f5576b998f7a2e. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/DEMV91805516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ba0e2e0d33bba62d56283a6d5f55eb88889167e7616f2b090b65f188af2e00. 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/DEMV91805518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549afc570e01889144c3883e2149d6ac6f4920e1586c237a23c2253ace05098d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEMV91805519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7211f7b5d022a0421964229f605daa6c56fe7f0a1a0575abcffdbce0f690ad29. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/DEMV91805520.