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 0x3a7174d6b6791c251ae0ab9c20e64e0da3e194ea50102f1656f0663758005bab. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0fd3477-e562-49c0-aa64-a71ea17ccd37.json and https://artists.proofprofile.net/proofs/artist/c0fd3477-e562-49c0-aa64-a71ea17ccd37.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 0x316c9c4f5ecce0bd07d9c8632acd11de635f474eec80ac8460335ae369a810da. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBLV62217376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4c3b549c0f37950fdf35baed691e121cd2c295b4c900ab1c75d5dfc2584d2d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH6542360874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fb3573e1c10dbbc37e604a13a7938582e9aeca569c48698dbefdd07b0845e2. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CH6542360875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47175a71b19e02db3b1fc6fec42b5e56465c80ab4610ce7bcc1898590bb66a28. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CH6542360876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e25cb2611845ad4312f299c5a1828fa86c3dcd5742a6d3af0c72e5690d926c. 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/CH6542360878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966cf51ac31de83236ace3e9915b43d2f1396fc2916753abdde4b3ceab692667. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM8DG2446164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498b2ff2b74fe1e2e9ced46e2b6ad540cc563649cfabff4bb3ed4a2c5727ccaf. 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/CAHQJ2457631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a3f29eb9d306a8ad4b3cd4a81e82a47662977ba5185b545e8c8f6a10b1175c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CACWV2459635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf570a6d39a95bccfbcc9e8aa246d6aed7021bc97092d0ae1882215a14d32434d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM8DG2494717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4461fbc881bcdc1ed87a037539c7918bc7f1eae5a3a16fc7af210e16db3a89. 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/QM8DG2448481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6a35597da159da663ce62782e444039ec3d1478d4a49373f2e68340fca9c08. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFP52414245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725bc2db40ebec1569ddef3da76c8f6dc938f10812b9d278f0ac6d578bce2529. 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/QZTBD2404402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a5d4b6929bf43a5f1fb9bd2c4c49618ee7df5b459a05417bc39e98804e419c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/FXR752411137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42607a6658d61e7aaf2102990c2361cfa82b4ace93eeff01b95227882877150a. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/CA5KR2519613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183238acb05303d05f9e2cedcdef907cacb47321ca38bea91bff00463bb2f543. 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/CA5KR2519615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb0f710f4b25e632be4f332409903e3939792cfba0085124b3b914c688f08d4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CA5KR2519616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e09d2ed57f11c7e7bf88d301cb15a0d30c73d13c2871bd583431bea39255db. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QM8DG2548848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e0ef3d2e653770d4807fc7dd1f1c0c0dd0082ca05325860ef883194606eb46. 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/QZS652577761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756b051210c905120fee392aefd82c9353087f7669c535f4f9c161552c514cce. 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/NLCK42220285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd23e31136f7725305a8e8c1e7bcaaa0730adaddd0715f96153bf557ff01f821. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USDY42297222.