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 0x03d9abc8e02535568cb52107f897273c5fb3e0c4ef3cd18414b371f04d81d912. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0dce5ca-f89b-4ada-b5ed-987024f62679.json and https://artists.proofprofile.net/proofs/artist/b0dce5ca-f89b-4ada-b5ed-987024f62679.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 0x222a18f7c3a74f8d600e5ea275aaede9b81acb244b979358a49047acf7c1fed8. 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/ESA012519518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa807c5bd1e97386be02ed35fd2d35cb4755c1373fbca3c09dcc52ac39740dfe. 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/ESA012519512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dcbd0d24f4e07131dd009ab04941778e1235bc2b4976f634ef240d57333f772. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012519511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580e40dcd1248476367be207042e5a10e5671689ebdba41f65e1fb108173f6c5. 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/ESA012519516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0f00a93193cc99603b30ac4c4498c9631640ea788fa24c299c2813b6cb9903. 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/ESA012519519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9b6db3751338b66729039a9206fa8eae9fd2b9308ddc4c375d8ff05d1393c1. 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/ESA012519514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f10b73cf5dcb2d93076642696c14abf116f8ded708dca94f3396aa8bc8ba96. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ESA012519513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc791791889186c2f8028fa0fd05c8e4c1863a15d6af16ec77e57e4d9fbfa536f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012514311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f296ff5a4c5b584e37be96e78cdf7263d513787f179fc82bbaeb39405169a9a. 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/ESA012514308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf070f04c11ecfc4a65ab0af67bfaeac2b77b0fe27660bb2d21fce28bd9018a83. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012514309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dfe861a01c1bb12e518d0c29b829deb01a54165382b1999e54ee41eaa2add9. 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/ESA012514302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e0df377cc76624475a9966df71b615c1f1b5e3f678eea42568b6541a5d67e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ESA012514304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3910065420b2586b9489a9665266495a8b054a813ff2ada394028a1060e82023. 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/ESA012514301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231e83c57695a147945554e3dc63c2d965443aea04e6a9304b4567bad6fb6e65. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012514313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332c2294fb57057c1958ba22b5d003e1de290badf9fa55acc4fcc62db07df0f6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ESA012514307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edb292738c2f80b5cb7e40b8f738f22168d7de87b0af938e4de1ff90efaba24. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ESA012514306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c4a3c627d870ef6a1b906d237cb9d5d07b0eff92d703b7e977e88ad7c38c0e. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ESA012514305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0608ffe31bf1935bdc67a663b275b911b6d86b5f213e9a71213bc8badeab46. 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/ESA012514303.