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 0x0811b4deb5e587a7bcdac5651b47c60165aeebce1624c25da0de5d9814f9a7ae. 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/bb6c7de3-dbe7-450e-a903-52385231c1d9.json and https://artists.proofprofile.net/proofs/artist/bb6c7de3-dbe7-450e-a903-52385231c1d9.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 0xbc501e57e5ba03e9a8702371953fea92688a88e7e3784f80a6a351a98b75ccf0. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAHO2339143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57361052e55d656757d069821c1815b5e1a8be56d960efe52f1b58ec0fe0754. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAHO2339148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc912560a61d85f1602cf849472cebbb9d0e7df9bd4d09194146ec77dfc2a8ffa. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCAHO2339155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe431662de068aba26a5a4e5e6f8c76652a037b12dc5cca33ab8f60509d1937fb. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHO2339158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3260b08324ff12be743a820c36363f2788e5f35ce0d365aaa5e9075af452ca1b. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAHO2339161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05cc20cf8e904491e4d75e330d296d5517074e12f7c4f00e28caeb2d3aaf991. 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/TCAHO2339164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981f0841ef345e13b2848cc62a0529efa50446d4a68d889a4adddd4240ea9fa0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAHO2339167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc9f8717eb4de548021377ff9ddacb614c88a42b7f555dacd637c994ecd5eb1. 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/TCAHO2348459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadca723b92e62220d5c8231e487c5eabd6550a4572f94458833f5859ce54d630. 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/TCAHO2348463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef5841d1725531543e04d1b5ecea001eb7c46fa057c35d02fb7baeb296270e2. 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/TCAHO2348475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b34f22a294f723c6983cd6911e5bdfd75905f02f5319dc2f88383db83e7017. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAHO2348464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa36bb8430449a09ec55f1326f69e2e7ac4716764ba2bac7897f94c04b60fd47. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAHO2348455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac153bf7272529ec81f98b1f08f67e9324f6ec5ba2b74d9a49a2cba8dd89ff16. 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/TCAHO2348471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a0207ab59074ad4fa16d9837c59395d0349b31c4331bb70d4fb656ceeaca37. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCAHO2348478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d87d5da95df95f67164508f36be3c58950a6800be0970ef097a5eec0bf90c4b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAHO2348513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1749ea33c28a4a0bbb992d7dd951f66246061e7e8a9b7689939435a4676f793. 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/TCAHO2348522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2c0cd641169021e7db37d64740789a4dd89be145eb68fd2faf5759d95a60ed. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAHO2348535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0767ee306834365578f9c636a02743ba8e074d8a08222cf304cea8bf08244a0e. 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/TCAHO2348538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0566e8f3752036ab3e248671d9df435688ffe4689cfa3c22b87443df87d0a3a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/TCAHO2348541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc5a29481c9afbd50eba7d653b7ea0a0a5c2860122889e02c60459d7ee1d9a6. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAHO2348547.