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 0x16b2a6808c1c665d86ddb0b6518dcd5eb7054d72ac40d07744a167e6a1e02c19. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f78d3b3-4709-45f6-a58c-0fbe13217a3c.json and https://artists.proofprofile.net/proofs/artist/8f78d3b3-4709-45f6-a58c-0fbe13217a3c.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 0xb338a5e07322a768dad36709acbb6690a769a8481575e1111789f1ed00731256. 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/CH6542107779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4371a097e1fe1e1c8d7a8c98072d556cb0a882bc4fbaf1e22663173032518ed7. 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/CH6542107780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a64766bda876b9a617079ccb8af372d5305d1c98bf9b7583af896149215c8e. 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/CH6542107781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9327b7bb073557ff7ef115b5780c8a9f5ec59e115982111d2ff9968229dfc644. 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/CH6542107782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d44dd7fb3c35118742251da8266b685773d62dd938e31ec05ab68e43d23cd7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH6542107783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413386dee541a2ff47d15f3caad4cfd1f4e810e658582b05b33cb7b69c02ef96. 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/CH6542107784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94212e868867d84cc6803356ca6ccd4e36c283ca9ddd9fc576a9b8d5c9785753. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CH6542107984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14ce01d43bd0c38982af673fcfd73402328993b33e6bedf6a313e179739b774. 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/CH6542107985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1ffdceea5d09838d1483bd326056f3f42cd27898c16d285977428658be417e. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CH6542107986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8c43c98fa9bdbf49630c484703e565d14a25d6a23942a8cc6d2d20a4590111. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH6542107593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9770c9876dbcabceead8e9cc86d73e32cd9412dacf80a316b3d13f8475a5f42c. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CH6542107599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a895c78376e20ecd5580b9bc849d2b80df4622e81d4314df78649ff35cf970. 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/CH6542107610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe099ccc4b8ca5f2a1c8bd929778078dfda92224c7caa9958949e0cb79ae4045c. 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/CH6542107614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391892138b242179389bb6b53c6d444fbae8659e077350c5959e625c4b42a41b. 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/CH6542107616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6b6ae1a4d30200242308faac300706986628da30628ea19ba595c5d81f8b4c. 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/CH6542107617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe99018d5d0c73762b4d36b8a499cf45c9ef91387aec9822a15894bcb9fb6b40. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CH6542107619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308768074820da9286c19c21000361a77d998a54b650f2935b2e830c836f3894. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/CH6542107620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfaf0c8b4f4d3cd69582cbc4da569c8a01022ed29bd198c72b3aebcb478ae28. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/CH6542107621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dcf57850484f7f277584568974f59c3e61f08f4df19599725157728142824a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CH6542107631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34069d65d59272f82ccf58bb956e510745811fab39154d46a8d8eb315d3210d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CH6541665828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e32e33553fc7f075ddbe33177684934a93fdb8f6801c5f2230b31a54e2b5c3. 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/CH6541665822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338683e7a9f251de391fd9d6372ab467f11094fb788918b45220daa31078c4bf. 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/CH6541665823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b97b4f9080f82f49029698ed454e4f10098e84340e321fc7af9acd142b92ff6. 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/CH6541665824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f669fd1fc8612919b21559c4a30b6b44c02394d166b25c55af1ebc47781389. 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/CH6541665825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9745bb5d080db0841514b5627257215e792ca921b95fa5d648fa3cf3942767b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH6541665826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a75c4158a2ed527537c0800da204c094eb28965db3414a549e2269c443a7d1. 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/CH6541665827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460b4a860f2f5643a8a99bdddb3e1362ded6fd2920c724f71094925e8c918076. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGJ1705285.