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 0x10b4d2d8d6333d03be574a42d620104b70ba0caac5587d37cb6f7381e2085167. 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/6958951c-9c12-4585-a2aa-f6dfed1b7dfb.json and https://artists.proofprofile.net/proofs/artist/6958951c-9c12-4585-a2aa-f6dfed1b7dfb.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 0x89997ed97b04b8b4f59245e1afa2fe6ada6d2311ca7b174edda7bbd28357a21e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/KRA401500505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c9a6ce795fd6a8c3f914980653867523cbf5d39f8dcea45661e36b804b5bda. 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/KRA401500506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9d38083eb3b6d0f5e4fce9bdba0703630fd9384cef40115938529fc998a468. 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/KRA401500507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce998e2c5ee12b66bf1cc5867a319e63acf0db04d1970ce9de41026a8eb85df. 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/KRA401500508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33aef37682e09320da675facab18c8dd83be08997f91554bc6f48dd6204bd1b. 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/KRA401500509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ac09fb5280f43c87e772e31aebec22696257514b2c4534e82e1a5ecba28371. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/KRA401500510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8668ec11d7cd015c6c9d4c0e8a0d46f2f0feb9939a819052df7e7bded3f02546. 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/KRY661430280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043b1439714f6bf6b85edda7386f2cfc5671ea152a11f2dbe81c6f63bf61f72e. 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/ZZA0P2309256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0e29e3cbf766f5f2f66ddc209d0fb32123c61ac820e38c50c21f3f8538386d. 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/KRB462200812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657292dafd5c153a37274124ac716a417e1245b4d71086c6f13766ae06f4e405. 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/KRZ291610204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c41e23f1a1655d8c432547823d94f654c75a2fe1ee4b651f887f168b3f5eab. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/KRRAR1707003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8a9ff02b74e48337f5b09fe9adb8d8e97fdcabcfc52883c7adef5deb080a75. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/KRA341779377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac4006354865e53235506dd71694baf7c27df91cf1f0a727221cef062610fa6. 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/KRA382006958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141448db7ac3ad3445b8eebf0e653fa1e3deed66a75e438bca53f32b3d3b0e89. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/KRMIM1918090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe898bc4ac73ea4f04b8aabad728cf4b203a9238a9ebd68b6f40f034b4ce66424. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/KRMIM1918092.