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 0x166fde0f1bb2f108ee6e78f5511e14162575f17f06a4eb248a2cf847a42d599d. 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/e6626e2e-972d-4b7b-9f9b-784b3dbd1cba.json and https://artists.proofprofile.net/proofs/artist/e6626e2e-972d-4b7b-9f9b-784b3dbd1cba.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 0x49714c95e31827c9bea05270b5822ad21add6549e66a69bc241dfd43c221c98f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d6319d6bc36d288e7ed75532a1a5ca6488501666bc6636461646833814c1b5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52ff2b6384b39f75b12f8bd585752eb2c2a52cce50bdf355de4e051657661eb. 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/QZTPX2406941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e06c2ba851e8e4d8876feb6619fba9326690ce792c724a80af816c09ada22c8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9bddb140b8ba24b97e9f209abb61710d76306b38f289a7002f714d5694aa66. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTPX2406938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bf85b6dcb244dbc8c9d631c80526be789f315c5184e5271dcfb9d4fba9acf7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3af797994bbfee73a1132cbe683fcb960901c31a4963d13bb09c4e9a339ed5. 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/QZTPX2406883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe157f6a1f866d904c21fb9a61d9149b7dd3836dbd408ea6f42e9c5e1d2b564a5. 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/QZTPX2406936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99ce4d36605246932a6b77f815bb82ab307cb9f129084523b776bc8c1f66eb5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60eb4b23287b33169c8805a2856d6879aa1cd45ad7f188aa102ca352b3effdc4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe0bc99225c1e1e9ef79d93c69fd30a7fb9cf18a8c991eeaea7ba16f978e0b0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950109f4d13c680aae5811fb372725cd8ef05284de60906faafdb739875ca65f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3d764b69d3469efbec4c121d8bffd7ff85cd4ec6ea7510ff51a70f3f84928b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZTPX2406843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3fabb90f72f26dc8fd05d2c56a31ad09dcc61e0622299732eadc94b3942cab. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTPX2406842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7997e828f209344073ef956205d72d997b95a2b8167722da6083ebfeb0164517. 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/QZTPX2406841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493a0fe12fe864b957c55f315ea3631050728b21d7f2d9fe931827e2845c8a5e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b880b52fe0f7488789b95f1ad0bc6e2f8e4d7540c650441d95356a7a1040e9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1709b1ba41c5d0b13913a30f8a62b36f8fb33ca6b50cb149c7141538f653d7a9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTPX2406937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064ba734458b342fd2d68bc768502b0c39534383a8ae25763aadc3e762cb8443. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZTPX2406844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe644d3a47f101c9dea2625d29e6251f942b66fe5eb5b7103b5904315ba3c6d69. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTVM2459077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1685fa4c7fabcf4cf7bace57c2935867228458b868c49909ef10073cf7d96deb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTVM2459068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb014f9a8e46abe6c3f1b73fd7f69922de4bb724ab84eefaaa07e93db4518c8. 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/QZGLS2525044.