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 0xaf665470b8dec4aadde70c4126b08190dfc6d2f72ff6470b843574801d6d69ab. 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/d3ca8797-e136-4740-a7f9-7fbb1ed58ad8.json and https://artists.proofprofile.net/proofs/artist/d3ca8797-e136-4740-a7f9-7fbb1ed58ad8.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 0x97ec8b643d7cf4fd478c7250472323d156de13b55372fc6c31375dc56a810d19. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/HUA611402114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa8a2a4788cbf777c5adc1b483e19b8752d79f164bcfa5a77e93fd2d1bb2faf. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/HUA611402115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28075deda0b2ffaa163ecc7ea1772e636e55777a6798a6725f58a040890b4c95. 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/HUA611402118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3efaaf7b70db2983f3e63a6e276de422e671086b9af60a499dadae6e4d479e8e. 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/HUA611402120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4609afa003cf03a82a5d3d78f63ce69cac0f5c31122f394e17fe6fef397ece1c. 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/HUA611402122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4b91dbdea46580e47c5adf7a7198e7299f686e67c8a9c8286748330c42929b. 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/HUA611402123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb566c19ed72791f0e57cbda2a95c67ac44649f421f3888a58e9b829f8e038eca. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/HUA611402125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07171a4e8cfb2b86db5f4d3a289edbb9d5b55d5bce7c8d01674102019d44a1ed. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/HUA611402126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e155eb63269d702b6331349d426ed08afb7472ff44f2a4a8d6c1e9e8e4c81dc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/HUA611402127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf248a0b04608102abab2bbaee3af4c5cb38c96b54ec541f40042e05022a214. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/HUA611402128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d6a5cb9d3cb8f7bbecea54706665c4b6d8b2cdb99466a85361223e092c15ba. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/HUA611402129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe107e6d6a23bed929ce18ba8fa85e31f7f89fce477b8388382069a69fc8437a5. 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/HUB161113164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33db2e4a0e23e0a48eb0c308236bf2ec13eb68253e1a6037d93637539bba3125. 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/HUB161113165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252f4c1bddf47884cea617ec56bd1962c072e3de6751be4fc47937babfcf1f82. 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/HUB161113166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107f2d598f757ff3e990fc7565abe4e0061a3efc9bbe043617582eb085b50da3. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/HUB161113168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613de32acdf224e577b8a31afdaa406fc78e04770077e1146108577ad9d0c311. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HUB161113169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9d15458c03d52a7ce0dc0292d0247f0932f5a0a6dca53faf9bec1f28b773b9. 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/HUB161113170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd5f98826fa20a076a511092beb9865b3aa21eff7951ef85f6c7075c1eee6aa. 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/HUB161113171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22344f5491995bfc772e0eaf7e59704782a85eeb16bb9e91e6065f019326131. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/HUB161113173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf19c73a4a139cbc7bff1fb5bfe3a47ea7c57025ab0849bffd7dc04085cd5fe7. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/HUB161113176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adfb51e949822cb2a2da1e322bce3cbc397de1097ce6f3876a4f0adc709bcfc. 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/HUA612022999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f708cb357387ba8184771d14fabd1875151fdc034b76c8e15e39954183b7560. 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/HUA612023000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a672bca8d89ce3643c79181289bbeae683f19db58c16436e6e722cef8aff3b7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/HUA612023001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6866bb72e4ea1f7eeacea08614eeab8e92aae5a40614133fe88a146171cdd4. 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/HUA612023002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7874a5f4232e5fb30e9f04d56de6139135b9d0b290f332a2556dac4240a9e684. Chain 2 (Bitcoin): anchored in block 957895 (2026-07-13T18:41:29Z), 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/HUA612023010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478abe331c4f0922d9257fc25d79e90fa6e68794f0ec541057232c469a1b911a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/HUA612023011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc418d1b1e73467f5df9f40f07d6b56d3532eb244ebf6b43afcff369d65e5b54b. 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/HUA612023007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1041bb80c7c8f2a37186ea42007a9c525a0083a3e2e74c5bec54f939519a3501. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/HUA612101425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a24b04a693c49af6d45947adcea06345b107c623ba6c20afb4a620a9e7d40ea. 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/HUA612302920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57a49a9bfc8e5d80361e0d84296871297baec148ab68506450de149bfd94ee6. 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/HUA612401071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96f0866c05d6b6e14d279f26a87e09d85423d1783799214d3fd3a57b8d7ec20. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/HUA612301869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c7c13d706f28e35e204896b9298abaaa1e78fbceecc83b086ec3527f52ada2. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/HUA612401074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a24b04a693c49af6d45947adcea06345b107c623ba6c20afb4a620a9e7d40ea. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/HUA612302920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bca865ed965fd61066ea4b43d27ee635dd1ff0b1162057355bc956d0d4d8043. 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/QZRP52330060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218fd822c8c7b0ca57f58c3f883eeba08a75e9eef21dbf834670f04970460e0c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/HUA612401077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb047bbb4d60c446917dd225c1a4c40ea21d21c4f025ebf078e6487f5e3bcd464. 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/HUA612401286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e6e4715a9bec7d412bbee549fadc1aeba2788dded6f58d6fd9cb6210188b15. 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/HUA612401081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dee0c69e5fd80d285b02fbc7f0d416a7680941f162ff026a911c85cddd29bab. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/HUA612401287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee24b280b21eb0c5a1f1c3750a3969c1d78c78e67b81891a6328dc7557f2fd97. 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/HUA612401085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232bbe6b098ee66bd784b8dfff9bdec534ebb0aa31c4b94abc7900b9f76d9cc5. 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/FR96X2245242.