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 0xf8554a742b23223b9cc8873b5d1e2be4e2bd48b4f6a2cf018ef2f6182f5f6308. 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/98544891-de3f-47b1-a64b-e13a6f4b3c02.json and https://artists.proofprofile.net/proofs/artist/98544891-de3f-47b1-a64b-e13a6f4b3c02.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 0x7fbea8621465cc75e4570bb74044f2598a0e780316b5f20923efc3fd6b00b0f0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZCE61812297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3dc13797010fe9b80b60f8401377b695c6293b9030536aeef4a0d0d32b3ee6f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZCE61812298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf100f15bb70d585dd4616f1ff9b78fbc1630bb95407ed5135268e39876e90727. 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/QZCE61812299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df1708b8fb22a74c07cd9ccacfe9ef19742cf4d32ad2de7ac88146980ded074. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZCE61812300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698c21f66b2415e1499003f175a2ec0a6e83e48ac5b065818e433d5132f03e6c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZCE61812301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8b8215afaa71873c6a7f231b5b587e337823caefec19daf808e41af2e2e349. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZCE61812302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15778295976612e8aa39dfe02e8ee6930272b3c15aaa866f6b2891159e92a8d1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZCE61812303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b59fdabeae4fe8f42d1ac225e1a922677f2e4f06218a4dd3b113203f0ec552. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZCE61812304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fce8cb12862ec991f638bbfb9c6f2802204875380df52e20f69327b676b107d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZCE61812305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3bff4060cd69af4ac7d0dfda4cb696da7119b2daf7dd24f4bbfced02c00ef5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZCE61812306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14685c4a6391065b64f9441b635c9795d2b7192d9764e24c53714367ed73c88. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZCE61812307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fbdaed59c2fc37efaa024cfcfeb8531e8c868ae2fabe2de34bf2e8017448fa. 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/QZCE61812308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01b9179e99cea80bc337807a9b5eccc5cf930a28a03b6427b04a7e7ec215a1f. 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/UK9RJ2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b142d49e20c760c2b57a925486edc0626ab4054c7ba10a4e311acd448c20c5. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/UK9RJ2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8555c8b68fb9ccb0f8cc2fa8ad9dc4a86ad6da683dcdb0356bdd311113a8ad. 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/UK9RJ2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b0f9e6ffd1ef7bbb16363c6def49c09adf5f42e268858760fb25df2a7dee28. 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/UK9RJ2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccf216b7c74302b63767a9e66fb0e8e32b5102718a4f090b1f862b3b122cd1a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/UK9RJ2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1e3f4e5fc1500be7e064361918e346405eb00a40c4ce915214487b7d527292. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/UK9RJ2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6be3f5d42f72acc5f02e70b6ce84ba7c30f6fa7b190d296575e3d3f80bc14c. 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/UK9RJ2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x371b83edc1bacf8f8b6757f35a489d9a40d85ceee866ba2947d2ef6961aaa845. 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/UK9RJ2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4b28200eea0b12aad1a73b4da47be0ab8849cf163c43fc3da23d7c1a33e36a. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/UK9RJ2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bd366cf85b365992f35d3068fcda0c547bf3cb9ca06ea2efdbea09683857d5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRB62100002.