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 0xdfe38c749ab93107931ce0e0eb18453627057636fa8cd450e997b9001728e441. 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/663b4994-18bb-4009-a3ae-4162e9ed205f.json and https://artists.proofprofile.net/proofs/artist/663b4994-18bb-4009-a3ae-4162e9ed205f.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 0x21c460f26a7118d7a519dddb8b5e523b1c862d738f937652d83ba1f811d1c522. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/CH7811820113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73698714f81df1765f1a650624f78bbf26534b20cc0daff164424c201a6c24b8. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/CH7811820117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b0f74696a6efdb2c42c37a7914f879b251c2231cef2682168b6f4debf8df78. 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/CH7812042359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe949c4ffe0043fe928f2bae1776d13a80fa41105dc5811a7abb0e04f9990afc5. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CH7812052982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef898a52ca43762a4fffdb6109e28f459a4c00f16e4a33842d7a9a2ec0c15b78. 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/CH7812057974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7e8e29fed79f6df1f75a34a7737cc151708e3f7279378c6c8ed4d5b9ad9db8. 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/CH7812176591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa8bb15bfdb9eedc627f3da071006a41e0ba3c3d3d88d83c3245d23acf51f2c. 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/CH7812180211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89049a1e25a471dd163bb09e0f3301e69dd8f4ca44ec36a276a3254cd672c69f. 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/CH7812193378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363fecfa4aa46bc3887dfd725ddc97c0fe2c4edb21cf8eddc1d8cad91b95872c. 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/CH7812195330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9110acd53e42205b1a021f7c7d55a1e08a6a4283fddf99ef000245d0efff1c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CH7812195332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5185f6502bcece3fccf9ebaf15ce01e6058020221f417866ba22450d66e91c20. 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/CH7812100977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c26aa521aa23953f704ed2d2c90fbf131f183c128bac27f54d7a11e5531c4ae. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH7812104001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0953d1ad83c5ab879350704ef4e381bd4f1978bfc0e88c684ee01b7bae5cf992. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CH7812104002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc22b60bba735a0da4b1529199a7c34034339d7eba2eb8bc60f33dff26be0b2. 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/CH7812104003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf908b7b2c534a21383397060a604929eb3c37170e42a2efd782204ddad4f3b12. 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/CH7812104004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2230a69a41e98becfe32397af91d8df6d4ac70b00283250c71737e58127c081. 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/CH7811820116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66be845b0feee39237f18ac4a1ecc7d32a5db868da625369adf1fdffeb8413fe. 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/CH7812110857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5679ce21c1107537488574631df75aa09f323cb4682639f0b4bb69d8b5b1a605. 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/CH7812214764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb155531048d28b8315e2979c1a46dcaa7f55640a716f62425e57ada24d66097a. 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/CH7812215776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bcae4e7e0d8b8c2291ecad4067a1d37720975d3b02e2bb2ea0f48dfaa09be3. 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/CH7812215777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d9de39642becf1d5758edaa7960df547364876b916ce79dee9fb127cee506b2. 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/DGA0M2318441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8260376c99b492a4ee14310bf5e6c015364a91e2278a5d667aef310edd2f7f2f. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DGA082496701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d361ecdc63cb4e939ce09c4776d41873c7e854857be437fb82a16cc37fcf686. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/DEE862500323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c25c7b8296c579c7816beefac804b9031bee5c0687b5090a97081bdb7df1325. 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/DEE862501491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f985f5b312d0199084ad535ce32ba7a493ccafcdc7a2e300323ae1786aa453. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DEE862501247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758c0b4e2a9fd47db3ba478a0309ac4b532d1d9a3b06f82eda10c4097d87270d. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/DEE862501098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406f2428fb7eab49670c9c5e51fd8afc7ebd286dfaef44d8a17c19511e6c2f69. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEE862500823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa698336dbbc5cec6fee296bbba0aaa3b1ff5ed6b2409dd85e7c38b6482f547bc. 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/DEE862501522.