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 0x4d692ffa33c64692b18036157d8ae43b9f7f3e524b97f7a7704b1ed34827c94e. 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/6d5c9979-6a4e-4949-b6d2-a9590e62447b.json and https://artists.proofprofile.net/proofs/artist/6d5c9979-6a4e-4949-b6d2-a9590e62447b.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 0x3c4c7d4f79eba8aa78e6532b3eda652e6a0cd671c9bb2aa916a29a6a5a7dcd1f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/AEA0Q2158877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9975e16abd472e4da5ebaba489b1e9266ed224bb95567fd24c02cd13e1b5909. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QMDA62146291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ba62f4b4bff4d8ffe484efb6332430eb8c55cb25b9f02513058496c0ced232. 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/QM4TW2220802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe796320305a9648dbb278f739a8058a7f98e0611c5ecd48e537d7f77165f82. 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/QM4TW2246824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a6a7ad569959f7363c4469dd9e3eadd83c70b595a9aa350e2ff86e7f2c4307. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QM4TW2246828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cf45902e854db4def8b4960512f8e0ef5f1dc59be7f3bbbf42d0554380f278. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM4TW2246836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05891375b34fa2934ef16a88572299343cffe557da8894e120b45e5f4163d7a. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QM4TW2288921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea7ca271570a606de601c18f18d72d34e6f5da7a42d0e09702f2f840f03201c. 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/RUA1D2254854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c9bd25504ee3b1c4e371f35b20e3025078dd68097d3201027e333305b37590. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USANG2466987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d3315b98ab4f88c65eaedb37f652d74a8a66527c781ff25f77398c88db4985. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QM3DF2417926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bb581cdf6773112e7d36a3cc1e56d0e7f49c3d0b3ea962fd29e3843547ae79. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/UKEX32461642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f4f412de00f5b18a77eac86d803da508e2354d564473519a42ad997a3ce4c5. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/RUA1D2537470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5163767767b4c820a01d6c3ec4edd9407ffaf28b3caa3288759e6cc2b0016408. 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/RUA1D2578287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a0c49df03416456a76417069c3b3a953d688af2dcf772f6f3294df1d60eb9b. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/RUAGT2554309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263e14a759e6b8e34829c2aeaac015c21b4e5ab62b9139a16798f5a1f1ab44e7. 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/UKEX32500330.