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 0xae66267bea33ed37620826439650e677c4121cd9fe0c3f7d7752ab3ec2b77c98. 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/bb5b1914-b650-43b7-a0a5-5b809448ecf5.json and https://artists.proofprofile.net/proofs/artist/bb5b1914-b650-43b7-a0a5-5b809448ecf5.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 0x26fc956f4d29a772c72d1d3f268bd2a8aff653c678b5df0fa9731ac579013d33. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SE5IB2339519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1ba81d8d1a11fe8e98c5635793fa42ee871f85232be12bacb5093b7f1e5f64. 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/SE5IB2339399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03caff59ac03226237c48bb451985fca3bb6a0ad05944b35717bbdda8c462e0. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/SE5IB2339491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0182e09adba75e6fb34737062f61555f681e06e9a5fe77ba36eb6335ee66b9. 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/SE5IB2339387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa134b5a0b64590777035ccd2f88ba0b92ce145e25c87025e84dc3ef5d35ede67. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SE5IB2339391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbf1eff4945287c255827acdb81d7c2c4336dd89ff4af39627175d412d5aa7e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SE5IB2339395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc353a78b0f4c5b5527fdddeb11f607c57afbcd78fe4dbee37359bf9e72910846. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/SE5IB2339403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd696e4ae950f7a1f270094565255b00de7f6d0da92efe950006b28bf57d6ca. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SE5IB2339407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496a8aa4034985988d6028ad690107bde484e125e76e85dff85d0ab2e0250398. 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/SE5IB2339419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6e910b74f2e933e7e932bdf53db254216316b77f4c0aa996d29913f64c0561. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SE5IB2339423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c07005a0ecd16c85d20f3a9cee21d2326291bb179435e51065101bbaa1264e5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/SE5IB2339443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d0571654d7e5da19ce340625bce00165c4c20cd8724450c4b838aeea6662fa. 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/SE5IB2339455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01230d8a2c6ffb0fdaf0b8d9e0e220b8a4f6d298d74b4651f33d0b8048f41aa. 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/SE5IB2339459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971cb7c79d87e81db6afa670aa06d5ad25420cebb1c6455908f888dcc495cd21. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/SE5IB2339467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c770c7538c09bc061efdcdd76c1cec4bfd4299cec3d1409ab1314679218ff20. 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/SE5IB2339471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a63358117fb293e7e3317ffb388ae9981b99fad311b996ec0115d554e40b58. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SE5IB2339479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb05c00e37f228934eafbbeb51e93f20adc40a6a01481b6a7cff7c939977a2e3. 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/SE5IB2339503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f992872ded187256cc3df8286d86ed4b80869158b8b6088ca9a81239e9b211b. 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/SE5IB2339507.