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 0x6a2169f6a042646eb85163939cb58bf9b58ef06159cea0fc6f0bb1459aea8d62. 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/16d4cc00-449c-44c6-b3c0-3ae98b0e61ed.json and https://artists.proofprofile.net/proofs/artist/16d4cc00-449c-44c6-b3c0-3ae98b0e61ed.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 0x40b3dafa63b9d91b06676b56e2fa577df2ea40a6f6aebaa4b4d05bce1a8d422b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAEP2037746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a40caaf6cac6cdbdda66833046695a0f9bce80b1f03fe63320372542ff2b211. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAEP2037752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083d6fa9c0fc0f4ca08532acd92bde4a653db8055276392b158ba5e0fb203d86. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/TCAEP2037758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0ba8920a774856ef08bca7b6aa5752ba55d700d3884fb7776beb4e4f547524. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/TCAEP2037784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12146915e2311fdd33f3c796b26ff6c8f4cc657d3d37f14096ef5d169943faa. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/TCAEY2028615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a009a902463069fbbcfd1115936b15f3f0dde9cd28af2cc2567da07827ce229. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZFZ32360848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59857fb72749616236ad914ac102b849fc40a2f5b86f69d37cf62603f61141a7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZRP42109112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f35e40db409cecd3e4627db06e09c4734ad063c8d85e4b48992b30eaa846c8. 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/QZHNA2553366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212ea33e6c614f2ff3c48f19fdb48822bd4d7265438b56ed0a3386af5e6225cd. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QMEU32513286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7bba587971d46bd937ad5266a169df0d9900fa910e051e4df64fa795ce8204. 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/USHM21723043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cdb0bb6a762462b804f6e48374b2f18f79510441ff371f84eefd0b9fe6a1e3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM22346025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbd33177deefb25e4f045c821f16b7d0462ffad7adf51feff30a919f5199434. 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/USHM82134486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33862749dadb181b28f1d753482c98a155de3f71fb206836d83765f6c938d2a0. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/ITD879910101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb3ed17fcc0344845a12643553857e7e5f864b8ab8662ab7cd0583fc3b1dc17. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USSEM2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb3ed17fcc0344845a12643553857e7e5f864b8ab8662ab7cd0583fc3b1dc17. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/USSEM2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec0b1e1b8b55e7c410ed99e70b84041b717a4d97fcd3b716f9b2ac4603e72f8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USBP91900001.