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 0xed9174060f22656a4e759b3f1434c986389cb99ecd4d6ad5311b69eaec3b0263. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc846dd2-1543-49b1-9d52-d2059e1a8a8d.json and https://artists.proofprofile.net/proofs/artist/cc846dd2-1543-49b1-9d52-d2059e1a8a8d.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 0xb38af257f05f60539976258e7402e607d31b2e6a4ac11870df52a8964f5a721a. 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/NLG620600062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04795ff238ccfe3dda65213c1acb96cedcd7477019bdab2ddc32d3d97e4d5b92. 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/NLG620600063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa000fa67b9c92f82c7250ae461743b34deb4a95993eb3530526db12ce6f229f. 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/NLG620600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c136f9d99e34a7a2ec16553738056026b101c70b845b7e90be2edbd429c0524. 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/NLG620600066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73760bc2bdfdd4a8c23f239267cd5c0418ddacf3f6b73d1cf4c6a57ac4617831. 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/NLG620600067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b014554552e756ddbdd874cb4746f483bf7e7d731b12d256ade167f37edc0. 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/NLG620600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2231f7eda10e811edf0904dedc5c732abf5c0b00600f0c395b2cb7695f7ada. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLG620600069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed689e0f45026124de3c8346d2f0361a939c021fddace40bd0d92b971bd0e865. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLG620600070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ed2fbd102b0e46cc70d26e9b9d7446fcaab8b79539b5680bc7c231a5a51b13. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLG620600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48629baa221866569d79afc91bf7b0472cef39b35e98ca2f0895266fdaf0b74f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLG620600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee94bdaf75b29d3a2faea82213b74583f1ccd80562b49b44b365dd4c45d7777. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLG620600073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d2c1c3a2cee70f854dda4e92ae2dea8144cbec7983df2277cea09ea5f3aa9. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/NLG620600074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0451867e044b760fffc9c3ec67006c438044bbf1b8cd35b984a247fbebfd4409. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLG620600075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706506417e1269e4b92aa7f9be9b04cd311925f6ad18d7ac8c5f97b8b809f68f. 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/NLG620600076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93c09994c078cd1955b534b4a0e65fe5c02f313d3e287e5da96dcd204f19665. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLG620600077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2ba94865596503884a8453b20886d1e54e6fef67e28007e7d16948267d1a24. 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/NLG620600078.