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 0x4266e594d7469221de4dbcf219059258c65adba3a8dc80a7af84acf672cf9fac. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cff53e24-f65a-4811-9291-32ead8260f31.json and https://artists.proofprofile.net/proofs/artist/cff53e24-f65a-4811-9291-32ead8260f31.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 0x210fe3e4792ac92240264deae4513e2fa52877e813ff43320e9ce74573906bad. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAEQ2060400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfceb077473a0c43031f70e843d034720be730d73b4eb2fbf15252da74e118d48. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USY252298205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bee17a7f74cde0fab13a3da3454d5025df3d5a659ed6d467d40aa64f7eca51. 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/USY252298207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa181427e3d6132c312145b62fb253f9ffb02c36622cf86924244ff1807b2cd7c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USY252298210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec219f24f4759d17b923d24276bde8bd1f2e88168efbfca5a7d7792a65dcda6e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USY252298211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a00a40b4ea84b486b7f8c55f6d3053124ed2465c560a90d2ad0583a111412d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USY252298213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb7815a76b8aa4f2b6f6cc41d6357a66a98b914e2bbee9fd6d9578503959c09. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USY252308879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93f28c506608d17b51734ae4efebf4fb9265c3a0576b6d175a6657b4770a192. 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/USY252298214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82cd90fddfcea09fe8a4f31b9787f90ba5283a10363b8fd31fc8d7067fab170. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/USY252421996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd82cd90fddfcea09fe8a4f31b9787f90ba5283a10363b8fd31fc8d7067fab170. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USY252421996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8615a0e70d7c2e1f76058a6cc6a6bc42bda8b06220c8fd48b6baa7704f8143. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USY252421997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e43bbd724a10a637afc935da2f861d6439c215c869014a0a41cb1dfaf03d016. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USY252421998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0a4f9ff452304e3e83c61a14e87c37c1f6e28d88a0cb6fe335ff141db250c3. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USY252421999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d448553f4a7aab4437a68d506e4cf10f7943038b601c663b2114e3d70dcfe32. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USY252422000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69bfd67b3b602f87bbc9b9bb01ddef474fa01087200ccf98d003ba8a885fa96a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USY252422001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3f6b8dd428765d95169f4cf3c96b8a080b7fd5f9bce281dad49b3a15940972. 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/USY252422002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ff6a95c5996a5cd76a0f27cdaf027d64d792bd4802ade692a97a219cc1103c. 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/USY252422003.