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 0x6819c55140dd01e9ab06cc924c9dca1c11a06cdd593a9144c9fcde101fbaeabe. 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/5146606f-67d0-481a-8a52-6442c383d81d.json and https://artists.proofprofile.net/proofs/artist/5146606f-67d0-481a-8a52-6442c383d81d.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 0x38fd2870312a74e252499b64d03e63b1df763db92a02f2f1bdc5d50967a1df84. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PTVI12000160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7395b0763080e608517ba7d26b0589b6bafb61e6704fc7fddf85c8ff6211bd3e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/PTVI12000161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534d10b7f06b3d5209ddffc274c01926084588b5322a8431c30e51e3540e876f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNW72266811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06449e937e0e040680c3cba1608e22ea5066113177b631d3bced8d7c16aaea8e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/PT4CA2033938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e64fc5e4ac377c56ea0101d2abfbe6ca1dd75b864fc648b6be5295877d217db. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/ESA012253610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4e7f445db44d8b107f60b38194b9f64ae6ebc3c9f5d69141397d14112c8600. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/PTVI12200351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f24a807e54312f90bbd606500442db0acdb5b8051db14d0081f42cc1bd8715. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PTVI12400182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34bd38ba447d74c7a1fbb2a62abc5e6395c1c63da1236d9a63be3d2d23ba321a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PTVI12400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba76cc3d85a9522be61d64c231a8c890e3d6bc5ca64803ffe1702f3879e5b768. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/PTVI12400184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f60d9415dfeecaca9247087108dedf8ec5b029c38869bad82b23556698ab1e7. 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/PTVI12400186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c46a4213879630140d390d2a6e8fd17e28316c32dd1748ed2caa8dd9d66a1fd. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PTVI12400187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f12b1f91441d8387b63707ce62812b3a2e21e13e68621a3c3a42e0eb8ccec42. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/PTVI12400188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f713a2e5ec6fe1d069181a0c7cf00688656654b2ad19026450ee3f0e87870e4. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/PTVI12400189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a813f1db362d34f5bb8c2435da15981110cc8cfb0d93ae3cf168910f498b51. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/PTVI12500590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dfa31cc6145f80f74e6ce6d2667c59f4c16e9942bad66496ed8f3baca94d65. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PTVI12500591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb006afcc344f982245974701456b018378de7357aa6e45b8bc67c7a537c0ad. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PTVI12500592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d906d02e95e431b4eb8c6d514e710c5f0f8e37f6a34a2750c8f25860110061. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/PTVI12500593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed518effb85a92dc37346c772fe13d1caac5be49f443de04956d47309dc29e4e. 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/PTVI12400624.