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 0x796342b45edf3c2124c8747446b8833fa5e243bd5f9e9bbfa5ed477a8a6d4951. 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/cc753aac-a546-49fd-86b0-2f04f0ebba6c.json and https://artists.proofprofile.net/proofs/artist/cc753aac-a546-49fd-86b0-2f04f0ebba6c.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 0x2c1af43697e514f371d3bf1daa0a786996fd712e0f6991571226dc9274a100f2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6N1948554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef93231b23dc460f4dd40e2503763979225373ad2f1f8795e9ccc4179f4d630. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZMEM2130987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba08ec9d8b3608eae1765ca2e3b52801e8f21c5efb918f5ea066fb0b44ea86f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TZA1X2201052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ca215582ea7117aa7151f40f8d5275663a8dc88c3f65f41b7b9f93e49491e4. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZFYY2237151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e42232a2e7faa5438a7704f77c9b493d849041946bfceeffafd8c2f964ea4a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TZA1X2201055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2286798a8b4ffb900d4bf710f6be31e4b14d2a59002e3a5a2e188135b6e8267. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TZA1X2201115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4273178d4d239ec9efecb6b88d83f0fa08fe7ec933db3d3d07b09a3e0f0d2ea. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:07:20Z), 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/TZA1X2300080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d2ef38a9543f606a5adb64cffc809ca086d83e968db1ab97bb83e003bc7b51. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TZA1X2201114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25a29da2258da0f7ddb5db30326852a7b932f37ba90dd0da42a880c396dd805. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZK6G2174113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeeb7a57420400c20f20f4624d274741e4b696f3567f8f0e17f4cfebc159abcb. 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/TZA1X2200974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e3d1adac44918c8b437f5fb721d10e0bfd9683a116e50c0d1c3d5265fd87fb. 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/TZA1X2200980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727006544858701ceac8ebce9a6099a0981819c4232f2835b5044739bbc69fb9. 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/TZA1X2200981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a94941b4037106aed8c44e5d45cb215043f4c6e95d57048ca613f25af3e0b0e. 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/TZA1X2200982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65962f31d33d0ec288e2cf4105a3a71c0a48a67356e7741230fa5902843eb23e. 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/TZA1X2200983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe489e939e03fc1db9d7581f8ab42a24e020d307a8965b6c150407cd62917b3ef. 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/TZA1X2200984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2dd82315210cc8983ab0a2644f42463de8cdfa6a6f9a45a77178967ec0220a. 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/TZA1X2200986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f96d736fa7900bed87cf743e5a12c33ff00b76b483d374f5eb7603c7fc87950. 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/QZNWS2367271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb254f2015a829b440684042b02639fbfa70e7b4a75c5e7887c1926f9fd68c91a. 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/DGA0P2303525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05825bc5ff1cbe2922ad264bd935d13d48650072910ba01b86a3ceb69710c63. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0P2303526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ee4862615957b37582f4b7786df0d02ab7aed7b7b0802f84c7c9dbfe6c3494. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:34:35Z), 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/DGA0P2303528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e366572ba7795b9c67c9307953f9b640e47f24585c1cd8645e4f9394266ca8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TZA1X2201056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12575537c844990f73bac15e9f1ad6d26cb2fc412d6e955e0699d066c2725935. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DGA062493507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9f754f0af611084566ca845d4e203b4d2877ff7a6c427abefbfefc1f000f24. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DGA0R2474345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e800d8110f2b9c595ef670ed0e1f8122cca926249ac6d6986adb80588652dc. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZES92546714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6452887665c316dd651eb83fe50ce9aadb18ad89ac12e8c82e70990f890408. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZHN52517310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88b8eee6af4baf8d631fbc1d3c988970cab82c98fbe329c3931e7513d4bfe1d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN92565753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120213f2aa89a6a0111f60b2c34052ab405215cc9ea1bda40f5852087aaf8424. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZZ7R2545446.