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 0x9e09b5d288e508ee7c05b282a0f1469f2a5d1b73effb1063f94f644db24b56f4. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a553e18f-7e68-4ff4-9e55-ff7d0bb35365.json and https://artists.proofprofile.net/proofs/artist/a553e18f-7e68-4ff4-9e55-ff7d0bb35365.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 0xa8b52600541b453ae34cdd92ee5f221b1c6fccdc137b29988ddc57f0cf5dec80. 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/GX89G2341939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd6968377c027db15384a8106bd894a143cc3ee6d1ac164723e48c81fda3509. 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/BK4DA2317734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b3406a15dfed60c9e10103c4e630fe393f1c03f3d6407a54eb92de9bf2aa7b. 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/ZZOPM2239800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0519e7ea2ea6423e21d201669f40dbdd51162bf4f793ed543c05df0cf5fd8c. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/BK4DA2317735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff11bf27dc6e394bfe50015167aa07e5480c98f530fb90256dba693bef84669. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/BK4DA2317736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf53147556f12cfe03aa8b3ca3203be3b8dd1e6c9997fddaec68a2491aa5fe1. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/BK4DA2317737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a0ac82841ee6e9b9a65b35f49c4955f2eb14ad229c44f6186a7b33a5d459e1. 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/BK4DA2302021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1219a0521a352bb4d6f626b1822819df12ce36d1779fd59c2332429c5d2b6996. 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/BK4DA2315564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0541ea146cad69119850ad6cb9d39e50effbc141ea2603698ffd0124ad071e60. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BK4DA2307271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eec4568113492e939ca9f2981411262278265b987d7752991e615b90c44c36a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BK4DA2311936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6256c7b22de474f6a1930de194c515d4ae96e6f43475bde86d6a0c64512ffe96. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/BK4DA2317738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155816ca3057342bbca37bd066723f1b53f396f0a092fde48f7dea408180c91a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/BK4DA2317739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1219a0521a352bb4d6f626b1822819df12ce36d1779fd59c2332429c5d2b6996. 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/BK4DA2315564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c836fd055931141d681d3812a07c903812f812a11da8977b35610873553c0b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZPLR2490040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16127eb30e24696aed7ef7bd4101e3ad073ae7303e8c3f90e8aa7936f56ef299. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/QZTB72306860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a8d47926706b7660f3f5b52a34c23e39a6c453df7abd8fd533c1992968aeb5. 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/QZPLR2490041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd185e7b365cfdaf20f4fda1dbd8ef1a964d31dcf6e67c6423b2c2b377e2c5b55. 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/QZMEQ2415513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e6651b6b5c998335e8ceeea33d08b26a29dc482e3f540d909f99ec2d1c85b6. 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/QZPLR2490043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed4fd926391e5c19c78cb25fa538165a06f07262c94e51d90c29153880ee809. 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/QZPLR2490044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6367c824ff47970a482a43548e5ffa061a1230585791e863bd560d98ecc440. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZPLR2490045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4340ffbf92241c7ccd41ace9be98d711032c60652710803a80c47c82655f3359. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZPLR2490046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357fc8bbcff654269d836de94fba5058114a7b4d0cb1b065138bc3bd196b5af7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZPLR2490047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74170f942740afc5dd51cb3d6c6fec746bdeb2033557adc785e57591a05c8c2e. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZPLR2490048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b8d87b6462f567ba0fc8a2a1c19204cfb0b4b54acac96f73769c03454200ec. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZPLR2490049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4361436171bfa52260681e825068200631c2b0ea889b5728d5dde792fd097ee8. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZPLR2490050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489df6ad5b3ff235286f063070a39d71990fffa0ed4b1779443c04ac305e75b2. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZPLR2490051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d78c23fd8e4f9bf2c84aa16e36df618df6ee574c52f721200f7a1472cdcc0e9. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZPLR2490052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1405fb6c2ddfbc72d700f2f2e20bbd810e120f74442a094754cd892a7de0eb6c. 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/PYC842405980.