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 0xe5b0faed292c23163e8ada577a5e67c59dbb46dd150179a1df7bf2e3fad65646. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a7a1d79-aa45-47ca-95b7-ff63b18679b0.json and https://artists.proofprofile.net/proofs/artist/1a7a1d79-aa45-47ca-95b7-ff63b18679b0.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 0x2c12dc92e0fcd9a9beeb3391708de31f873bc3956ca7861252020c8e61aecab7. 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/QZ5AB2054312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aa9a394497bf8d0ef5a68127d2d7b9bceb61a47067b3beb9b6bc56ac955c4e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZ5AB2054314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46acd9e28e4d46ddb8deebaf8cedfa8d407e51dd1da303250a2a8ddefb255ce7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZ5AB2054315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b72847172e9101a820940118435b135314ac105122b4cb44cc904066652df1. 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/QZ5AB2054316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed70e0437b5088f94002a236a58594062152c4544a4bb1d9a06c1dfe7854245. 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/BRLSR0302433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62754013c1ff70a80c95ed41f400015d47ac7b2b75d5e86da5546067faefb050. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BRLSR0302434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662e57ca090d6bc0e2a464ff5f2c7c81fbd5ae89229dcfbf692af013441a6938. 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/BRLSR0302435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bcb38b32f91e41d17033361bcb20d7878abc65f71ebba2392eae5262b2a2a4. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FR2X41937297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117dd07a737e5ef0d9b0d88d08c2d9ed6e5d4e4f4df7204d7555bd85c7226466. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR2X41937299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e223b2f7e0177f37efcdc400dc6112c096287c609b05337584e33ab6bf08d3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FR2X41937300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdba6f0f2ac2e15b680adef0ea3873cb3ab8ad4685439ea1fefb6b4bc32e328. 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/FR2X41937301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcbac16f3bc822f63adbeea3627fb3adfa356dbe9d5b6b8c6140016984ddc67. 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/FR2X41937305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcb1bba910c9b93386342264d791238f59c0d22b43725e2db3eca629b9ed51b. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/FR2X41937306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7ac95802f85a9eb3081effa045b2a1a0e70de508c8ec7094a85e4f86d9c0de. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR2X41937307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac33e82cd5a90716ad2ca09dd500df7b9a5e5d735fe551c04f351c7885531296. 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/FR2X41937310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8888751add563975fa7ff75799a5d93f9755191fcdd900d4d4eeba0d3a18e37. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/FR2X41937314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453c61559098889e91ff1b5c9921c9774ae2fdb9ffae7239f401e36bc97467fc. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BRLSR0302201.