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 0x970ec59f80635091a6bad3bd02be0398f4cbc47983fe4b0ec2330bf1e10766e0. 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/499a4891-d037-442f-b992-2a02eda8ba1d.json and https://artists.proofprofile.net/proofs/artist/499a4891-d037-442f-b992-2a02eda8ba1d.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 0x9682bde69afbabef5a90abf4c3eef6a055775f97139c02fa9ef22d580de84026. 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/DEZC62207703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac3cb296319db1b96979418088491be9bac313fa57b9c157406d51765c0b8c1. 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/DEZC62200580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272da99001d489106431c5e554bc1fefaacb6bcfd49e1642c93783977bd282ec. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEZC62211923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fcd1720c022c7a6fe10789f2855c2baf6d5b0f19b53bee78d012a651ec97d6. 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/DEZC62211924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaea1cbae1c43fbb2bea20cc23970742f7621891151581c43397e675f9ce3437. 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/DEZC62211925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95515efd0c5e0ca3e5570cf10f236566cdd415a2e1d34aa3cea8f2cc9d5f26ae. 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/DEZC62211926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf937ca3eea5df3f44c44572bd441704b304a85945c61eb0d1b2867d384758f9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEZC62418039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbb37429cdc860e07268a355c6f8d0132ba03bd6bbb20052eb08ceb9fdf22e3. 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/DEZC62432257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a7ce368cc7011639bcf7f8df1b12cadbdde75f35ce191b8bfc6ce610b0cceb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/DEZC62581098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a7ce368cc7011639bcf7f8df1b12cadbdde75f35ce191b8bfc6ce610b0cceb. 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/DEZC62581098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f54b8650177e17d93ea91a4bd7cb7305c464481d15548f301bfce5d55f5506. 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/DEZC62410253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf937ca3eea5df3f44c44572bd441704b304a85945c61eb0d1b2867d384758f9. 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/DEZC62418039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd882f4e20ccdb1c1b0b0080cd32f2a0ce7287b93803d4c052d0a957b34134bfc. 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/QZTAY2317030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc64fe5661c47b67e65f43166864b695516d765008527ca2b25162d899df7e46. 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/DEZC62592393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8aa69db63506220ab1eecac4d0f2fa47b6d4c6e34535d3578d1d4199223a588. 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/DEZC62592394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba711adaed79307c83877e9d50f54eff2481983f69fcbb95a8bfcb9b0da7adf. 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/DEZC62592395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95627b488d6ada12bf14d2b92175af69bbe6baf44e45d95102f42b1e3932a71. 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/DEZC62592396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf327f493598abf9f0c7bd554ba1b9b47d4a1b62d10049361fe0f9deaef1781a. 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/DELJ81967947.