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 0xe1613244bcdc5e1dad27f48193a47bc9befbcb85de2d547e4f6113735a85fc02. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b4341a1-27af-4d45-a715-333074ebbbfd.json and https://artists.proofprofile.net/proofs/artist/5b4341a1-27af-4d45-a715-333074ebbbfd.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 0x843646d686129cad907bf00c76497f2b99abfaf9dcd4f02f1a6b8873d5003f86. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/AUBEC2343141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f4fe28a74675de0e6e9fb8b39026a334fe43daa3a1bccd00e6868267997d41. 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/AUBEC2233388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754eeaf7be4fda2fda67379030aa358a6aa8e9d2cd3a764448a8fa7c64b36aa6. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/AUBEC2343142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a16e4f78b92c36bd4eb4f40fb4a2ab42d6dbfbf2b3e9016e4fd62fe9fdc51e. 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/AUBEC2339854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703b833cf0e4e19b30b93c79f8957326fc392abae294d3f6eea576848a45aae4. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/AUBEC2343143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cc6f6cc0c95e5a771bb4397d3b1f8b04a07ba74625f5b3155aef14eb2a6b80. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/AUBEC2343144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f4fe28a74675de0e6e9fb8b39026a334fe43daa3a1bccd00e6868267997d41. 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/AUBEC2233388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c42cc15c3e1284ff8b6b5cae29dca5a616cdf6726e78effe7ff833f87eb5a9. 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/AUBEC2080245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa881f99bf8a938d1af3a764227f9ab902e2df34976ac74d6d7f40583a5c9e63e. 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/AUBEC1920772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19881f6a0c454445bb9eb8d3b7c0415d6a01ca3f3bf89292cad84bb95310f99. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/AUBEC1920723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ea2eeeed8cd98c974893dcde0787c968178daed8a38743997ff37dff34688e. 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/AUBEC1920750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07236a6e34e89ba0128db53ccc212f2c5bda3871d5bab6a3ba9bb630cdd78c1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUBEC1920726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b4d7a8722966bb54be6d08b49a84e1f89caa9f85104e8e4aa6a7797440f221. 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/AUBEC1920755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adbcfcc76bbae4554c9676fc36a8a5a98331ce92074d226e9374a6f657a4506. 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/AUBEC1837730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5adbcfcc76bbae4554c9676fc36a8a5a98331ce92074d226e9374a6f657a4506. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/AUBEC1837730.