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 0x4329596be42c29a63d15fbfed00300b9288045780717a8d6c0b035b22cdb4a76. 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/81754604-01de-45fa-8a59-12dfc0fe164f.json and https://artists.proofprofile.net/proofs/artist/81754604-01de-45fa-8a59-12dfc0fe164f.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 0x7ec0f33f447f1baa812ba834383a39ccea53a4192d15fde5368320512024a35c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/MXA3V2410532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24ebd530988498c64186ac65500d32395a2e4642b76aecdf2ca4301f04992ec. 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/MXA3V2410548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12e64143eeee10f2fa82a794b0c4e9f11ad4a1d053b342032483c2e4119fbab. 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/MXA3V2410587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325a7a8903713ae7da96b5929a9ae0c355b27f158f7ca3c5a26e4a2f7f0ff645. 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/MXA3V2410581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5236942a953b1905b428e7fa8db7ab69544231d5bf58d53a14b7fb1fcada68. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/MXA3V2410629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf34343ae1074cd1c3001813778f04171b8fc8cb5436615caeae53c6a03becc. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/MXA3V2410628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5c798baa94b68f912179d0c3852241794f258de52af71a741e6bb5dbec0b4d. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/MXA3V2410630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eaba3b3eb5891361f077a38ce8f7cd6fee8112254dfc46c4a87d29ea093789e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/MXA3V2410690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011f46d26e9663c3b2a3453b9e54e6b2c62862eee18799b91a9e343b25722966. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/MXA3V2410684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fab5e50fcbc36d44d0b14181089a1b6934efa0a675dcf0a21c6e14c3b94395. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/MXA3V2410682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c3fbfec46548d4e715d7f8b15a9060929bcbae499c36b1acbe984d66237b81. 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/MXA3V2410698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f33f14ff0a3beea0fe6b32ec4f4eb8301f96cdb1076fb1fef5f54b43c1af9d. 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/MXA3V2410706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5807ac621ff8bef49d5104243e6b4ead0264c070257f5c81d84e39b564335802. 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/MXA3V2410722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a761db3823a84d4072e3e07bdd6c45a8081c679927dab6b47d61648b396576. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/MXA3V2410713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d0b53929c241b04ae225705a85a2aa3d236a0d40363dc628e0fe6579c4b5db. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/MXA3V2410731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622ac104d904019fa1c23395da4cfaabec0f16c4c9920c4c6a25c617ee6d9cb4. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/MXA3V2410732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596f25946d342940b4f83e0db4a86532bb3d759a413da1a00ac61d94b386b4c6. 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/MXA3V2410727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ea5b289ce06d52e95c70ef0c916e954e9b01fcd363b70e0e05bab9076ede8d. 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/MXA3V2410737.