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 0x1a4b028f8ad504247dbcfcfef60a7911463832ff38cc7652cc8ed6a589d0006a. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4b8b3b5-ccfc-45d4-a0ef-4d40a4c9845c.json and https://artists.proofprofile.net/proofs/artist/b4b8b3b5-ccfc-45d4-a0ef-4d40a4c9845c.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 0xcda4473899b06d6ed901f71db7c515d31c471d70e9bbb2f121f6dab1fafbcd92. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT6E92572737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8593f70f5ccd0e1d73ada58a970a6429f7fff4b7d8b6541d1c1aee02cc4d07e6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT6E92572738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383eda29f844194e841e6f43fa09914d061bc94d07e9479365ad74de9cd586e0. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QT6E92572739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa209b96fb68426e4e0b01f505db3dfa88c939a3f051f11d529d95bba53fb3921. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT6E92572740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7e08dce507433fc5464463171bb9df5ce88e6488b22d275b5cc73fb9e720a6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT6E92572741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf667ad0d32ad190b4d4f46140d3c4c04a8a80274dd76f8e94c5235df0c6496. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT6E92572742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2508bbc7171653eaea2f6e37c8d3ae3646bc3c0927d686a93e90c3dce2ce85ed. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QT6E92572743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a881b519be738935ce642a0b6caf5ff983d2e64743f857f62d0703752b8370. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QT6E92572746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3c90e9d1ccc66b603ed276f71214dcc369cbb197a071407372398ef7b9a844. 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/QT6ED2524801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d85ad0f1280e43acd17a93f09b62e4a9fa8b9f4568de8b64f58496f153ab6e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT6ED2524802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3869fb6e6675a523824100d5bab3d458b1b49f5e6e1e3d9354556b3bbf91d104. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6ED2524805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d912fd78d37c00fd256af3231da4512f730d2b36ad92a442314266d9f280f1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT6ED2524806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5214967155344dc135212ab753bdb4255b446833e9bb1da3a632d3451c5628c0. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT6ED2524807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92284cfa902cc7899b110db78b3f88825ae66b4b9a3d306d6f817e6b8b52964. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT6EE2542854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ea96fe3263afacc435474a37814f50541ae3fffa3b6ab737ae39d9d37237d1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6EE2542855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa291591bc822cb4daa3e2f89940022ab5d76df211fd926ec0f2b86ebd71a84. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QT6EE2542856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfc368ca0ce621fa8700a504b195fca1a79ff446d64e373fd749e71fbb603e4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT6EE2542857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aaf8cbb673cbb63a7cb2e0a7b05e9eaa328700a1ed14ccc753437a31cc5ce5. 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/QT6EE2542858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2ebfc3f266b8794833db32310839d20b1d661f3ff1576b6e1f1f929205ab7f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT6EE2542859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c160159ebd1703ca3aea72ca229387136431cb43763cb34c091a770db3a7703. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT6EE2542860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59532f97c94abf73a2a9aae1460833741b98a7a0c74925f35bea5c2d32a74d6. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT6EE2542861.