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 0xc49fbc350ebb9666e511871706fb3269f296141c02b3f9018d9d6d6eaa2bba51. 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/d9da4027-eec3-4cf0-b7e1-e2e77e6c78b2.json and https://artists.proofprofile.net/proofs/artist/d9da4027-eec3-4cf0-b7e1-e2e77e6c78b2.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 0x52d974b3b2d04145fc0038bf07e5bfe8f2dee33955fc38020b1fe957c2a18470. 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/QZES92511323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750461b8386325fa14cb5676e0def2a941d038bf9e694d2d378fa1c848d6edf0. 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/QZES92511324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bb98808ea24c5face84738453644c7b3f81dc06b19cf5a079ab4912ed680c2. 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/QZES92511325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf152627be3bd0316579696385f441964471461f63e59a00d25b2656c19db250. 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/QZES92511326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5f754f460dd222c6ae7d34fc94f2953c1715de63d3956462674e1cd4ef4a0f. 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/QZES92511327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7ed6aeb83082c3f0da54c0a02bd1fc7255ce735e7affb7ea0527421e8f5d23. 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/QZES92511328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f5ea95bb0723b65a5ff399ad279203e49a2ab992f9a4ce17d06bdcb22ecbdc. 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/QZES92511329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff5a63de8925566fa7931d1e611c2c9006b43183de6b33c72968356a7dd8635. 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/QZES92511330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4390c5cd1111144b23f08c340dbceb72032be23d7c9c04466ee93827cf6eb1e. 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/QZES92511331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605294a365b52be9327c58920f15eb08c66f8c3b38f2cd7f2f946affe07bb21e. 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/QZES92511332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3f9a7ec5bb0f5a4a744cced43d4a08634f2f210793b75857bf31fa6491107f. 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/QZES92511333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd17ff9ea258b3ad149dba0dfadbbb119b570a799912d024d94dde8f7cc2c73f. 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/QZES92511334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55aa6bafc2c33af3dee2fc6f4cdc123c8291d1a390b1a8f7c6711fd083083b4. 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/QZES92511335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b17020c6b42015a3f0079f65dbfa949d29a481df9b8e023d7d2b5f063d065b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZES92511336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb468080f151f145262b461648ca10c5e2ad92a2787825995caf9b9af880de39d. 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/QZES92511337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481872f827588d0445f1cfbd584825fa63a160c8699f3574cd82e935fb612107. 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/QZES92511338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f293614609e98b8032724db2483b3de4cc5324111a1e2b4b6b0278f029301ca. 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/QZES92511339.