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 0xcddea608598dfd2c89a76f7eb837652bf58cc636a3486b699f9a9c20d01c139e. 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/a5bbe956-4278-4fd7-920d-6fe816f85e9a.json and https://artists.proofprofile.net/proofs/artist/a5bbe956-4278-4fd7-920d-6fe816f85e9a.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 0x03b5176806cb1d073719a611aac18ee5f110e222dc3a44313410e39e61838531. 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/DEQ022007323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45dc0d9d6b35147136d4bd717001a4e300f4dd1d723e1cd4553920500342e48. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEQ022007320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dee3f0b9f44db0d28ec04642842c4417b45167932d03771eeed7263c4487a7. 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/DEQ022007321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973e006b8a72ee830fa2b6ec099d2695a94e390981b7e06c3814091aa6decc06. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEQ022007322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b5176806cb1d073719a611aac18ee5f110e222dc3a44313410e39e61838531. 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/DEQ022007323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcdfcc9a5896472e29af8dbf97dedd439175ddbcaf68ce511bbec245bb696d8. 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/DEQ022007324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70987cec7902308f8580d62ea6a4fe8bd670eb82dbbfc81f87cf162e7e7273f7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEQ022007325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b4b5d52ca548182a96de19b96c59c28e5dbead06aff1f1cb71c3e5f0968fbb. 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/CH7811932298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f21a13c782dccc6369e2a703e63574b6274a575316ae8f12cdc8d629b42dbd. 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/CH7811932299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0152d73370e2d7a0861a0569c8ba8e4cbeb7aa93d8e1458883349c534ace0d. 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/CH7811932300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1219763a76b3d14472b48540f366a1d93dabfc3bf96ab0b6f77b47283747bc54. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CH7811932301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fcbaf00dbac6d7981b8bba0a130582e699048bf9e4051bb5f9126185f1e051. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/CH7811932302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf974ec8b18dc22e34d8944a6ecfd1cd85e2e129144059eda7843a8c7b9616768. 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/CH0011900273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64550f735be30ec42ac3495c58692223cde1d8fbc5718790d0ecdc9c947f744. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CH7811932304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61125ae8c76d95eca9bca6057efa1c1c7411f0809ebaacce3fe590b91ca67a55. 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/CH7811932305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5383b01dcee081d05ef0e6e6f8fbed0ed91e438d86c0ae66ff1627990d1bca57. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CH7811932306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7635fe8768ce01d6a6563f09286c8e676201c2abe41acec764e5ab2d52fac48. 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/CH7811932307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c7615605b215097eb640d5565b25a8b685f792e2849cfad10d305c703ea6c9. 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/CH7811932308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25167fbafd43d640ae7aa95c93288e098dcade1f451340eeb1c47bbbc58d41b. 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/CH7811932309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85e63c9e16fc46627543150a3abfc3dc73e612a9dbdae92e69f09b7ae85951d. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CH7811932310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7af63f6ae0fdb18407bf498390f08dcb8f9c073c3e00d3954e02c7924a0ba0. 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/CH7811932311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9da5393f5434037a3dbd41191f19c53f5ac185a6a3438ffa8a9816f861bc98e. 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/CH7811932312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05dba4a6a1d8143fce00ab23dab3b50ec91eb8b5a1de2056b16f2e853e4f86f3. 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/CH7811932313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fcbaf00dbac6d7981b8bba0a130582e699048bf9e4051bb5f9126185f1e051. 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/CH7811932302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61125ae8c76d95eca9bca6057efa1c1c7411f0809ebaacce3fe590b91ca67a55. 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/CH7811932305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b6e45be768fb2336e775ae6e8a2a65a48a4e17c9745ccd44fa86d97d0636d9. 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/CH7811929970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf974ec8b18dc22e34d8944a6ecfd1cd85e2e129144059eda7843a8c7b9616768. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/CH0011900273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9b5369c67737384251caefb439801f9ded65428feec08617ea2fd19c2d16ac. 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/CH7811820394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f25f96818357597166a34764a7dfb8dd444920afc0dd09bb08a5eb0b582a6c. 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/CH7811819055.