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 0xcfb93840b4fbf969706dff4a3d1ab10f991ddafce6f153b22c4e896e51945348. 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/061420b7-ad35-49ff-984c-ec33acba4e38.json and https://artists.proofprofile.net/proofs/artist/061420b7-ad35-49ff-984c-ec33acba4e38.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 0xc1985e599c28b3e2231f6b39ebcabcc6b7bf3d6e3eff2088baa4e74f99d95020. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/TCAFQ2167491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826f8ac72a4630890242b4ef701a4af919d5cc85e3217e541bfa5417724d92fd. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAFQ2167515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03fdc1413fad8fde360e41197ca7775e71d825c76c8decdd428e018b4c04742. 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/QZGLM2348462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1f680ff4b24e926c1fb653ea26ab489640c50ce952966f7e930128a0bee203. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QM4TX2451291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd44eefbbda859f82bc72a927355d49e4bc4194ab712dfd5e692298dcaaeec54. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6MZ2474910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b0523914f6ae62677b62e3d87ec2f1674749ab7aebbb0d90e9f722c531b7e6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM6N22409516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484aa499418ea2d37cd65339f83b74a97d1bcb8e3ecfd796f1f4dd1e78db41e9. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QMFME2460596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327d7cd8508ba488ffb7d374b7b9f4be274c2c57f9446f0f35a2b6bb789c9c0e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SGB502502761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9eda30310078a600f793bc6fa4dced35ecebea1fc332ba0d552d82601fb084. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM6P42588709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab63bf11c384ea23688e7070c8efb0e7f53d004366f0b0061b75a39639bf6192. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6P42588723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0bf128d29f9f061e032e31ee6c86c767ff63c9de477b30233068c5c16e2057f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QM6P42588691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37eaa19d8924aaddd485e68f620cc75394daa126115d89d1ba11b88277c60cf0. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QM6P42588714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf90f11ce8e9dd9e6238f4121dc3e19e3e3cbdb9c9555db1d63f685a37a1a459. 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/MXF152301614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8173f71ccb5eee195aec090c62b7e306e9a4630f8400c4eac2cea49a5d21bf9f. 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/QMFME2242544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff50b25e893acbcf9f7b99a64a4ceae2fdb2193df18f6320f93d56c9b709da7. 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/QM6N22244066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f146157e0eb4d6a4463f149548f32d51a0c6f54b6c937cec60a7ffea60a639. 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/USDXS2101886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0001c809221c3c9b8a592a2c3eae3cfc05f26ca2ee46921ed6fc4d6eefbb7c49. 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/QM4TW2105449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee4fdc244d44d701bef6b6af29199dac24a2d91287ac742d026536731648f36. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QM6MZ2261536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b2d6de8abcf2b0be72c046f8497d146c64f384f0e40641613104ebfee21c84. 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/QZHNB2065299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0af89ec5ae413170a7d22948e1b3507b9d2386b9783a8a263970756162f37af. 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/QM4TX2201509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c0c3f9ce88308a971109a6be74a502c7ec2878f9eb3ffe29b4a34ad87e4393. 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/QZNJW2126694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335b150ba9981a07acf061d2148b1a0511444b3185637866da78402d491d8b7f. 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/TCAEP1906312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794887fcd2c19fa0f687133be97c397b4856555984b5cc0c6ef9f8d70fb6aa60. 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/QZHN22000125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351de6c3c94eaffb7aa4a6671c01efc1146213ac1f59bc7e5fffc110b9da0b00. 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/BK4DA2423729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9b105d1a21b5a3b1bba6738dd753bc72bdbf9a446d4d5de8e3728e332f0e01. 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/USL4Q2104946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc914f53e04209c65126c8dac5b8ed5043b929b58a25189d14e2c6730861965c1. 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/QZPZC2250127.