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 0xbc87b354c46c7c84a2e41a44846710a2e88970f15b923b751edc7125f9dc31ca. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ec09f1f-97b2-4aeb-8401-4b4a37636977.json and https://artists.proofprofile.net/proofs/artist/2ec09f1f-97b2-4aeb-8401-4b4a37636977.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 0x12f5c493b6f4d0b317e00d3413d259f4cedc9651f8226855630c7dbbd126fb9b. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/CH6542196786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac9aa5ba6312742f65147dc97f7b11898cd6df1aa9f1ee35ee289aef1b25adb. 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/CH6542196787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c6d9a33b82cf5827ca1d64e1e844268fa1505abbf4900a4871732c5296a214. 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/CH6542196788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82ba6dd2efa7a275bbde054183114c63dbe62a7e3b8e9e7227a7ef24718a9bd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CH6542196789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ff9fadf00851b5193f994425bf04c8990d6960b746c1a1a78cf40054ab3458. 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/CH6542196790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e5e2936808ddbed21ad87086705c1e5d72476834a755deb3003976aabfa581. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/CH6542196792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad847fd7b3a827a6ca55e8a3ee3890bf3c3817a25fcbe4774b6522aab5832dcb. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/CH6542196794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb974aad69d022c5d722acaf7810ee5dd22dcf95577c4408d2963a223c672e731. 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/CH6542196815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb333083869306c42821cec12ba9096e49438bc23d586471edc8be094c39099bf. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/CH6542196814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4de752a48c1fb294546c1c9f06e3194678dda00b747ffc41ebbd09c9b1f77c. 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/CH6542240586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0638a0087068d8ba0479253c7e13bef2d207675d3792d2501134a76718a8c4b3. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/FR9W12508252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3764d5cdff48d334975d86c5f284e1b58720d10986d4fa4a4d002e43865fb6c0. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/FR9W12508249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0672784fb4bee5d0461fb5d99911948bb50ae4fe7724aea522598fe16407b4c. 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/FR9W12508251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe341c6f42574c9a7f7b05b9c47ac19f10042a86eea93f90150936aef75e66e01. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FR9W12508248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0790331ad0b8a8d80f3e3a200fb96905d93031c60102f8573eafba52d44f09b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FR9W12508250.