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 0x6f1f25a57b0ff3d6be32a9ad9c2f7f9be5871b9fef0e3bc844357f7b9a753000. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2593e6b-17eb-424b-8d45-3722679d77ec.json and https://artists.proofprofile.net/proofs/artist/f2593e6b-17eb-424b-8d45-3722679d77ec.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 0x87c94cf48a6fdcb06911bdc5a38ae170199fc703fd81ffa5cd528a9d37038107. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/AEA2Z2502641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ecdc44c41cf9a07859817f22709a464d6006d641cb0bd07e3b1ef8e6ed8692. 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/AEA2Z2502642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e7ca8f82c9e7d8c8bec5ffb62a705b889feecdfbf10c4366bf0d1e9ace024c. 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/AEA2Z2502643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef223cf8e69766bc36b721d51f8df2797b48b55cf1874e3346b86c858d425f2c. 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/AEA2Z2502644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9441d3787d438b939c2ce61d9c9a4bbef1683a19a760eb8f6247be1a5fcb951d. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/AEA2Z2503100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981d50ffb1d2c8f6d92e09104b81d963cb8de4167a6615d06434e4805ba29949. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/AEA2Z2503101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9022835ba50e3f46b3d3d03e2fa7e6e1b79e2fbf683d4b8f6053e4b753080768. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/AEA2Z2503102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f14d16d8cec30e81778a9b621431b170088f3d3daaaa6e9a800265c9fdeae2. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/AEA2Z2503103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659b4d02a6b991ef971c32e2c36d5f65d513ce79022b4164903839ce51839756. 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/AEA2Z2503104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8c4c8c37ffbc52418437a308353109ec9d52adb0c3380ebaea4464ff13557e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/AEA2Z2503105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0abd4abe5fc71debd6c0705e7e7cd704e51909f1e8b1a7595b10a1e0d382bb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA2Z2503106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1caa701702fcc265ef05f5f44dd945c053be5cd426abd151a32cc972d1273c3c. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/AEA2Z2503108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6f0fc1145a35a24ff16bbe0ef032552523d6586a96951b9c80e7521a97c92a. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/AEA2Z2503111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e799c008bc732eb78bb03ba2dd2d0a6f353abe8e651fa0c417ed81ee75244a3. 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/AEA2Z2509260.