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 0x8bf2abd4ac309d381c04b7b95888ec21bda97985799e77f8f45d10323953f647. 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/40011c96-a192-41bb-80d7-705d8ddb2f1a.json and https://artists.proofprofile.net/proofs/artist/40011c96-a192-41bb-80d7-705d8ddb2f1a.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 0x0f3d18afed005a2fe4c2d030270f49514a475cfd0cde58a7aa6a0859fcff0e69. 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/ESA081301082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3d18afed005a2fe4c2d030270f49514a475cfd0cde58a7aa6a0859fcff0e69. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ESA081301082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d6deba71cbee24feab0963f5598e343e47db2a21fb77b8c5b1727bac745104. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/ES8241660301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db84c44fe14638fa4600afd9866239b57512c5ddc19a5b5d632b5a92da116e4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES8241660302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecad69f4f7fc5bf7d258a76fc2cd5358c67d1262b5a64ef17bfb384841234bc3. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/ES8241660303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6408a105efa73b6b290633bb5cd8d17fb708efd30c5fb295f1bebd0acdf6de63. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/ES8241660304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f908c21f00076947eac3ef2cf1fc5ce4d06a7746e8fed75cc578d1ec9504ca9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ES8241660305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf92fd5fc3994a011c8d2979fb43defcfbffe7a1423407f5a0c1733d655e865. 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/ES20D1900105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64034fe297213b4cf090733868ecd493cafdc6d9163637ab4b719f74853b9e4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/ES20D1900106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca9c56262e9c000e960a712abddf03e0d126fb9130f0c15f83ed71bf5cf630f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/ES20D1900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977ba016a6cbccde9e5c11af0bbd12ae6dda22411b83281fbdefc2e1993a9b3a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES20D1900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4940e66524d541c1cf40e77a0ebd3241d116c109aae29718e13c45d3a56b778. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES20D1900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8688703134b0437bed69d262619faff18127d6f5270d45dcef9c99d6835643eb. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QM4TW1915013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ce6a54ef760da6265ffd888218e0a618e9be7ad112081ed18dd53cca924b35. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/ES20D1900104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598ce064e4ad55480206d00fcc615c7c7113fad3ac8e1ae3d15399062bd0db3f. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/ES75E2207798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc2a7156b0d468746bcdea9d808f88619cba074831fd156df0ef91b1b9d9abd. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/ES31E2300618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2bb0384804313e48cd6b2428f097d34741d8c3c9dcd4854b276a80c43b21a3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES31E2301879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72d31689244023333d8aaef3818107c17d1692f103add6e391cd531b2dfad4d. 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/ES31E2401338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70483d23e6260a12b5eafc9f7bcbacd97627645862b6a1a2a195bfe30b1299ac. 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/ES31E2402049.