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 0xbc3693e5fc410beffe2a356820946e27e54a7bdba9e749d4155aaef10e086a91. 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/9c6639fa-da42-4ebf-85ce-1ead7dfdc5d1.json and https://artists.proofprofile.net/proofs/artist/9c6639fa-da42-4ebf-85ce-1ead7dfdc5d1.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 0x9512c2332b3a8a2a1a4a14eb79b79e1a987dc2b464caf1615ee265c734f70805. 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/TCAFY2102021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308ee3e72ee2c1ec23330e86cbae27c619f42a49d159f155de46309b958b934f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEQ2033121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0288f9546ca50f273852fc62f10e63073229f3b02519d0dea7ea1f527009ecf8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNC2051606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee60cb5a9701d22d93a15e1def8063183bd951fd2c2b5ffc0334f220d320bb5. 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/TCAFK2111978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c4dd2fbd0910dafd4a25d0bf01c44170ee22287e032e660bb270d0240ab72f. 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/TCAFN2155281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b03346c65376eaba70f93a393d823349d72df9df32e6350b4691ae3c861389. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZMZ92191705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab58e78872f14b2083067f97fa31f25d4ace5dbbcae6e28f2bb75e50c81f4b1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNJV2175548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe879b0ae0f2a6c030c77323ec1befaa02bdee575004207ec488abb67c7e9f3. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZNJY2155246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4827a74fbd00ca23b6374179a9adf7df51b887e147ca64fd56de3f613e63a22d. 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/QZK6M2277811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029345b5a28a416d5f24dec296ba76e06f134b5291275e9a35c815b6686d7c80. 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/QZK6J2287444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4827a74fbd00ca23b6374179a9adf7df51b887e147ca64fd56de3f613e63a22d. 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/QZK6M2277811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7617697f1801a1fb28a1cea5c10fe591451fa8dabcca98a9e4f590a45dbe57. 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/QZK6J2287443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7103cdfe70b7a1d63f98d0590a6f658ec5d629834416dd84fad4e40136d62648. 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/QZK6J2287445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a07ef5c00a03b729ac31903c84044e49342d964c9f9a4294ad3edd38414f89. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6J2287446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f92ef95d49a61a14cb2d5eb9819bfaed3193fa376a742019a5febfa202af3f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6J2287447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffbde89df988576b2fdec2c68bd9f3c8943d4bb83726c3cf7207d06c90d421b. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/TLREW2227233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ef44f818fa785d5df3751aefddb014d4938d40f75eb20d8a6c0a081581e56e. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CBB7W2311719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229a0e4bc7287ece626ff26ba68b8485683ed61f3ad69489d85931be66573656. 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/CBB7W2312747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f8d9fe6bcb633a57b70147d7e20f9d805ea8f430af7a7aca3df48bb01cccb5. 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/QZRP42345313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7d226d3310afe5dbe9ca3b2da66f784ffe68dc3a471b846c187cb1e7e383b5. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZWDW2442637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8c3556448abf5ab834f26d2c72309f31b7e93d2f2b4ef4bf72ea69a88204b3. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWDW2581345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b29821b55e1235b339f3355dc053a1bf4909cd32edde1edd7aa74b4c8b5b48. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZNJW2196722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5846b6f291b61f2b5273e20ec253b9b711a65c0ba032a61754945d087597a85d. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZTB92220781.