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 0x1a3b45258508196d5cd75c9534661f29611d5dd5e80a82c38bf4f978e30360eb. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4916ad4-def9-4f92-b5af-7f436e81a828.json and https://artists.proofprofile.net/proofs/artist/f4916ad4-def9-4f92-b5af-7f436e81a828.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 0x46cb83fadceab44e2219e4796d3c9017804ec8be81c67b3c073a31ecac6942f9. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QM6P42563749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d98fbbe1563288bad804f0fa657cadbac63e929441516f319e1ab5dcc496f67. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM6P42563750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ab7bf897c22648fc9a21f8cdb3c1a908eaee05484f5422295d95048bd01b0a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QM6P42563751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb7757f746350aaab7ebafebccc3ac25e335b0754b0e4491e70f0876cd9f98f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QM6P42563752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522389c8f488c10a9b22a64d73e6be1b672d8db3610744d97adbd53a442c01c6. 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/QM6P42563753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdbdc9f732a6a7fa59295d9fe4f9db1113af82a9aa50d91b7df8fb8d0b55b8e. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QM6P42563754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c92897d39433d5ae6358c0e9ba8ed08c0b8370ea9b45998cceabd256c8f0c36. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QM6P42563755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdda25bce254efe218efd716e167175139dd5a249042af9e5da95166c8f7d19c. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM6P42563756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59468f7b81c8211fa15bdeeaab3bb50a0a81800d663799daf6fe8ffd84a3d14d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QM6P42563757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276c155f9cc7f7357c24185f94c3efbb6362c91076417be02cf2854d05ea69bc. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QM6P42563758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7c434e025335ce708760de0cfc63685963350b6420f8ad8a9d9de97268a6a0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM6P42563759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7730b034ebd1d5b8784b4741089d812d2f74364b8b65b21170d62d37d43d9f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM6P42563760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d71b535bdf243bae1adad1f4c5612e6be1d137a0ddb36e88a6ca214606af00c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6P42563761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4244503e74e199f2f1a9a980ea25d296e0c51414e8357f5226f56cf81a94a1b0. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QM6P42563762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd41cb62a47a21053f7ddc5e19f24f523157fc6ab64ce57f4d15d56d00b5eb17. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QM6P42563763.