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 0x431990f26dde6839163d1ba91f745a002eaba46c9e1dd0924a68cf8b0e7ec117. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f000270c-fb93-497b-976d-acd7cbb468b4.json and https://artists.proofprofile.net/proofs/artist/f000270c-fb93-497b-976d-acd7cbb468b4.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 0x43539d0ca70d3cdb05dbcdaaf10c1c90f566f86752699e9ea6da45a5c399a1e7. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTAS2355321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e0c2069441d14e2859892d9c852d2589d30bfb4394e05c1cac9eb020b1f03f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTAS2355322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb13f2c98992692e52779cbc74e8bfce6ac4896b14e99fa746d58c4b6628721. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAS2355323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8dfa77e60c2dfe67dfc3bacb1b1eccef013bc4f86fcea75c6f21b288670c0c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZTAS2355324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eac365937dced5670f667fb85c831f23da6b37b247f1ab8018c159aa220ba6d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZTAS2355326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58158e3dc1d06a472a8e1ec0ddf7e8a40011de294703dd0e009635e54308ce24. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZTAS2355327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b564e147a62cf1c28a12352f7520318d0845a8f7a550832254802fb09fa6283. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/CZUM72400529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bac27ddec294a019367c9b6433b2e16109dfce30ca30f03a6a67e47bfc5a5c0. 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/QZNWS2375057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4037f750c1491bd216dbf20864029e1f400a82adc39c1a82c15202699931674. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWS2375058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ce77c756f9f90bcd8ada9aa45be3447e3c67b47f5e87be4c9f3e7b19972b19. 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/QZK6P2331793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e2a3094fd37eda349787490b0f58b661bf9b91a38764dc72347a4ce0f94d0e. 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/QZK6L2378635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa694f89d29c126ef80d09cab0d6e5c2a399b2f188a3ae8b24f21072b7d298476. 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/QZMEQ2364104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20c1feacf72d4c02e618ad3fc63ae78d1276ac5adc2aa56431c03882654823e. 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/QZNWS2375064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb455f3a5c3a1c223da6af6055bdf617ef68ea3e3451711c8e3b13947cdb4b585. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZNWT2328762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98af2f73684c7c7e215880139df53fa8e491e8af7e9af5282f6fa4ad382f8f6c. 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/QZNWS2375067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b76398eb73969719f7aaeb45a8d3dbf87a14207816c7cf8ba62de25324344f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNWS2375068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10fb87b29f94dfd1b08c47e6d5288f4ba9301fae85ba9d773873d67d402c56e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWW2375404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91dee392830c8ca97bb2f6eb452696b5ee78530fbbbeb57a7cdcaa845585ae6. 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/CZUM72400744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f97385006f6bb484b0d93298244ed04630594206928aa794c03d7c4ad6af57b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CZUM72400669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b564e147a62cf1c28a12352f7520318d0845a8f7a550832254802fb09fa6283. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CZUM72400529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2da465f3e97b4de8a8f2083bce84b6ef12835e2f51076504119d06f0937ca7f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZUM72400750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992fd6f929a1602dab9fedef53d26e02bd4a788532346c2124e5f8e032700e92. 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/CZUM72400601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c023021bbdec31419c18f0074ae3739fd7ed486bb99bccabdaa6c5841d144e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA42425508.