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 0xc5881be05ba459352bb7d0205217a65704777b154821c89b126799b27fca3ca6. 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/e8342e6b-305a-43e0-b440-2f23f153b9d1.json and https://artists.proofprofile.net/proofs/artist/e8342e6b-305a-43e0-b440-2f23f153b9d1.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 0xc3af4e3cadba073018b9fc3b0c792784f89f123096fc58286ac7fb2895ba4d21. 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/FRX452134678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63db5d375a449303b69030bfbe76d0377c5ff7108af711ab40859ee885b76a8. 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/FRX452134679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd498f9378da57f27334d3cedaf8713cb302ef49eda5714417c4bd1ea30284b4b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRX452134680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c9664488b4dc13c7c55f578f81daf346d8277990253067b6ffde32a59e30c31. 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/FRX452134681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c84da954116fb68b58455ea276320bcf51907e6a3f13cd5a6ead8b24722821. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/FRX452134682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018a6ef0aba2bd4140d49ac8c6c1844e47c635a37bfba076c288f624add61372. 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/FRX452134683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5213877ed6a351ed67ced19b12564f23d748e8b7f93387c2fcf953e1975fac. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRX452134684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f0078373e240491576eb4e18b2b9af031f9f77c7fce9924d87062e11189870. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRX452134685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825ffbe73b63e0e6dc532e13d2d28dc9c56b8bcef16e3862235bf5461aea47da. 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/FR10S2474458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab362c09eea804ef0538c29d59342a195d38792f8691f622177f2c43dbc4da2. 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/FR10S2474459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a1f7e0a816e66b8f7139cd62c92245f07a368dbac787168abeeb890c2a8157. 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/FR10S2474460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c37a5c36dfe8ec314ab266ce09ca45f22ed0a70b1cbea14f6a6580904920e52. 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/FR10S2474461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f665d44b20f71d1af9a520bc087b1cc772e7f792be393d561f6b8faa1b50bdb. 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/FR10S2474462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81977741f781eec46afdac6e041734606a07a352488ce2df4f1582f4c9e2e625. 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/FR10S2474463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e9fcf95fb97388073327d7e860156384506f8e754bfe623e451b4dd52dbccf. 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/FR10S2474464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bec87c0fda305f8b9f4925322227ea33e10570b07c5199b5d31ab956197539. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FR10S2474465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5aac5cebcd7f11b5ad6ec2a0f8acc476d2fc7bb35d98149d2edaa471f6e00a. 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/FR10S2474466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea35b8ef8f7cafb9265e2c5d5b865b3643d0e51a7ebf4362a3ae9b44123c374. 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/FR10S2474467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1825910e667a023a64653e4a0b1a5263cd9c0854c54ebdc54e125460fbf8b7. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR10S2474468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb79a691c1aa4d5b11f07827710f95db0bb8e3f93cd343905db1d4f6cf7360ce. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRX452339661.