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 0x7fa88e8557d38ecbcb26028b64c1e680fb83a9d5f4d235c2c481dce05756deba. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b228576-9af8-46ef-b9f7-65d5a2d9f761.json and https://artists.proofprofile.net/proofs/artist/2b228576-9af8-46ef-b9f7-65d5a2d9f761.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 0x252e46cb2a061ccebf64c643a6459a3c76381656163515695ee10ef99508b451. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZWFE2324806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3113a4c465cdb984ef0c06f20b95069ff943009e04fc70dca475b5b2a0c14639. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ATEK02477018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ff91a9b4ca741f0e008567afa2ca7040b12ab204472d835debb89d9e92264f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/ATEK02477020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081dbdeb2a6e63ab859941bdd571a44c5f53bc07b202e8642887b2a1e2ec8ae4. 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/QZPLS2493260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf003fba6edb39f11c2d17fa0fa5f737d2a3115eff988625b81c208cdc2924692. 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/QZTAT2411955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5bf49660b58400589072a1ce3c032393d35490c37af4a9dfb7e4cb7b9c2846. 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/UKXN22556341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96266a64cf6a423e4a52d0cd26c954ff16e8e53d7b6587c659f41d7356e2bfcb. 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/GX3Q92570508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879b927c638764340aa054fd2a2256e5784c5e45d0c42c42afac1d7e7344e161. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBMA22555231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb98abe625b1f7568f1fdf9654e4e4c0a7276e43c55103b5ff8fe2cdd5f2c67b. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/DEZC62508229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c9108eef0d345ae904132a44ec00ed27c343d882eaff76ea360beded441ba. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEZC62515902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffa57226ac227f5eb03b8261ff50100a8cba454dcc168d040171fbd11642282. 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/PLI366878321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f4f23f113e4f199fbba75e4ea94d7ebd60bf4ec15f75fe21af2bdb0dc988a5. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/PLI362842040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf601baba3d706ecc1e8959b48e1b8a48befb5bdb59a0d4158ddfa8ff73ff31dd. 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/PLI362842070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4721e40fdc84535d4fbc38663d37dd097683533450a1c005e0d877b57ed5b32a. 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/PLI362842090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffa57226ac227f5eb03b8261ff50100a8cba454dcc168d040171fbd11642282. 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/PLI366878321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f4f23f113e4f199fbba75e4ea94d7ebd60bf4ec15f75fe21af2bdb0dc988a5. 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/PLI362842040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa641ec96851a6b48f27d323fc49f975686fbaba074289690bffa60b652e622. 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/PLI369738380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918629fe3ad00946d73ea75e9133d9048b7eca856071f3133dcd47617e15f4cb. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/PLI368658370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c37bc2bbbf6b1342f2a24e6bf305a14fe45eb2276ba344b1c278cb6fc4cf55. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PLI362354440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d98016d13e59fc7e35e14b442b4235b7b6810ab61e3615f22ad903d9cd8418. 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/PLI369738390.