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 0xaa46d6db1d28dd21cc1fec1780480bd2deefe4d9c311e14f97746d17d7b824e2. 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/d44f8259-ed41-4637-8943-63d0bf873950.json and https://artists.proofprofile.net/proofs/artist/d44f8259-ed41-4637-8943-63d0bf873950.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 0xd9896cff08b65d29b9f9b168a081053c24533a132dcbeae343824a322be7fd5f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEMA61907323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d9aa886aa19374b9566f23e7e3f123deca2ec941a9793f208b7a9d5b3ba45b. 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/NLD682401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1023adf9518206325325cfb8db6ad25a74dba4de3c28fc30981c9259d1b55c5. 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/DEMA61907293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4616aedea5658dde2fe25475e53c8d15b886418529d9f51c8a540c9fb48359. 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/DEMA61907223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fabb051211987c94c8931a556771f0f3d1a6634ec69318aa831a3c9e36ad1c8. 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/UKRMQ2301487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a886dd2f5c6470ff95b3c3899e6ffaca963acdae12021475b531fb48a78cbc. 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/DEMA61906928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1914f9e49f3936cac29d680cf0b4b47015ce17afcc6bd0f52d8ba83ad7110f8. 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/DEMA61906872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c9a4a9f8a8ba37ba2bebf7fddb5b769e61971d84949626de48a5d7c9c81e5f. 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/NLD682302967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b812623ed82874720079fc9b84d3fedfbc1385ed837ee5fe138430372e30cdc. 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/DEMA61906694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f12618ee3f37d1f6faf81e1fee00d3d318fc213a3d3b09998a2c52552507448. 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/DEMA61906740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea85f2f10d3e65f870b9c677d177cfcf0a5b9b326b775da0e9621f1c603a974. 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/DEMA61906484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa928e3e8aac69c7d4cc6d38bd263332f4d1a1501a71812cafaf5f7d1975295c. 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/DEMA61906354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eca6cc1616adb3ec37726d20588ed94ad6952d96ac6edf1f5ab76a67d794df. 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/NLD682203091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feb9da6cb86e7c724f46545dbc023cb7bfb45518c006eea3c5d9c119b868594. 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/DEMA61905460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4080d11343886499be477aba9bf092bfe1ba96d582d899905578c9adc601fc7e. 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/NLD682502360.