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 0x2b9d0459fde2366bfabd5ee3243410575a6bada40f90ff2829310edc1aae030a. 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/fd23b159-0126-4d1a-9fc4-2a18f655ec4b.json and https://artists.proofprofile.net/proofs/artist/fd23b159-0126-4d1a-9fc4-2a18f655ec4b.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 0x780da388185f1fc7e6975a849016681d08ed11b432772712402384d9369b9d61. 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/ATT250107350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25be891e9d20821c89f5f3d44fa7f5d55f38f3b8b426036cc9b39e95e2df495a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATT250107430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970880a8a57c573baa7585145a5dd8837c171a612b873f2f061ca68772315ec0. 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/ATT250303900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa175bb046020b8e60d2310c642cf1df26bd2f698ba7249268a0eb34e19f74cf0. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/ATT250303910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1042b463037cbab2e372fd900a61fd4984583f47eefb771237ef35fd6c41d71. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ATT250303920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133369755f94d2e43578f5ebf84d609cf9b586b9577b5c988558049eb4b0d0b6. 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/ATT250303930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebd96cd5067636d1545e61ae5fb0fac3647d0613d44737d769babf0018319bf. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/ATT250303940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e20cb4edd4b07b3b2dd2cb47f89026355d98359928237908e756b1dbf16c3bd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/ATT251242900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa562761d6a0fc36b89a58e75d54b0af3d8c0ba9a5604b7a3e7a9f55a22c82d80. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ATT251242910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6635232714e47fb7ad75791d15d65779787761fea7216972794e9cc409764d15. 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/ATT251242920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59627f46ca9e237dd30bc432f8e3d44a7c396082a6dce72458279fdb49b49cac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATT251242940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25de8690792e252557397c2d936c944f83521af54f33655e1fdd95ec3ab3955. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/ATT251242980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a437815b0b5576107acdcab5558bb48bdf0aa919b3a2c91b200f47ace93e7df. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ATT251243000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54c414b0c8a8d57be5843d5738dc94430f29319cae3afd2aae1adb19b36a148. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/ATT251407160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8541ab3f96d294d1900b96a03ff5b5830be7ad06107b743009669250896f97ea. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ATT251407240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a014ba625490d950aa16410e2316391dfaefdeaf6e6a955a17a637867afe09b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ATT251512250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f9150f23a17369f3b013ffebaae88af579a429101511d1274fc62f11a32349. 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/ATT251512350.