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 0x294a0ebb259c13865d8780f8de54427f71626b267ed63d83dac3826a5d8705c7. 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/ff411fa7-fc26-4794-9e9a-17d1ebf60add.json and https://artists.proofprofile.net/proofs/artist/ff411fa7-fc26-4794-9e9a-17d1ebf60add.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 0x1f1315a2a11d965baeb99080027906bf72244056852e04258f71f7294d8cbeaf. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US7DK1400434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf73fec8cedac3a0c535eb6764323bfbae265ce3027271986adb7cf81b6c8a2a5. 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/US7DK1400594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa52ba1e3cb24ab30e8b1c22e88cb46b2cc9fa02b8451c07ee6a7fe7583527f6. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/US7DK1400599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b2d1a89ccd84e3bef2c9b332ea9ea06d2920721235b60650432782d8c6cef3. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US7DK1400622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd221238b530b363c6f0e385ebc77ec5612a500a8b622a0b48df2b6b64b1b9d7. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/US7DK1400691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f1068dca2f7afc293c3e21d5ee93314fbe62ad7dc6aa4127913234b5322992. 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/QZTAU2287298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25feb38799151b0cf728bcee1cdfa3f662679953557a4fe501e67a097041ba2d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWV2294337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576a2dc137bfd3856eb7b44705150dd56e4efa4306af9828cb5c9532e35fa816. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/US7DK1400891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa9e8099a18fbb9fcc691e8f8ecc92a8c765b495a95d8238cbac004e5c260a1. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZAKB2376649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e94ec4826f059a8a8d6b286f2df28a28a3950c9a062ff1700404f5e979378ae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US7DK1400718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18338e03095d0e182de3ecc31cb8ce6a74438d91b5e2aacfcd3deab12f6d93e6. 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/US7DK1400654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074ce4bb273bfd907ce07d0a054b6bb3320fecb8351394acaea6faf588ac7790. 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/US7DK1400518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bda8616cefea748fac799e29aecb50cf6a3cc022d4d347aca7978e45a023ceb. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/US7DK1400520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49163233d798fc3c4f668a8fd3e8c63bbc4726c799ef0821956f63f957fe3035. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7DK1400531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa54887a8e41a88421a2796d9ca82ff4248921c78361d86b8700669f4345989. 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/US7DK1400532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8236a94b25c79339ee902a679b5a210c3e7a01af68aaa7a8983ea5516cb1dc28. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US7DK1400412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c2c5534a26e9e6055c1f828fffb457a58fe666db43023d9888f848f6b54326. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/US7DK1400697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee39c84309b13657b73eb0c1669af795f948e2792bc34741888190fd34d7b995. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/US7DK1400620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974b0e1fcf6c81aa5522a66ddf9a79f4d50cae7ff6897d10d28ffc181314b42f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US7DK1400447.