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 0xa2359dd3f05501bdb39d406a71e73bab42b51fb174ae1f3e3bfc3ddbc98df4c3. 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/2ff1b4b4-603d-4907-9198-987c0194d111.json and https://artists.proofprofile.net/proofs/artist/2ff1b4b4-603d-4907-9198-987c0194d111.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 0x159f4ce87c68219ee16264afaacf660237a4daaa416e8e0fac6ebcb0c6e2a3a3. 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/FIBAR2100109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e765975dcde449bc4729b1d093f606a3b0793e17aaebf6d31061864b3112235. 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/FIBAR2100112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1c87efa8544d166ca305fac1f547b049e0ac4019f033039998d67b13016fa8. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/FIBAR2100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0919a5d6780bfeb4471ffd615fbf9dc20e2dcba4d213ffaccc34a75193ae1ce1. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/FIBAR2300500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e73a64f66134f5eced28789bdb700cb0220adf5a00d7572eb664a524892bac. 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/FIBAR2300640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6cf2591e7e90ac35e489385ad8ea84bf0489e09a60c2995b5d09fdd7a68732. 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/FIBAR2400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a92dbec689414584f5063682d51356b43cb6ac9f2ee49e26c97ef205336b8e0. 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/FIBAR2400429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be64370be3d4c8e66fc35ab7f75698a044c3ed85dc072c8cb3c6a2f37027cc1. 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/FIBAR2400430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bfe5652f38496678e2a7731841d63f53ab100eba6dd3fed52809305885bd91. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FIBAR2400431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161d4aaa3d2d2ac5419fff49d8030ab1b670904d79be8c12cfa6b413491bea9f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/FIBAR2400432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe490ff3bbf583a1ee869113f13ce29fd471abf91f7ad91c8f66bd78f617fa8b. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/FIBAR2400433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x868c4e054a3ed1b67d91dd9a03229656570d5b7c75447013b9b89dd7e6fc5ed1. 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/FIBAR2400434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a86cecaa31a4c3781c018f3fe58b67d0b9e0741dae588e76e4ea24034dd2f58. 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/FIBAR2400145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e73a64f66134f5eced28789bdb700cb0220adf5a00d7572eb664a524892bac. 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/FIBAR2300640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842a8618133db3c46a5bf4a1d8a7c419388505f23476b4fab929db8145beaba0. 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/FIBAR2400435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21656dd1f15d4e8bd8e3b9ae40a63de5ea5498e77fea4e2a682d7fbb6deb354. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FIBAR2400436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4997089176d9b6a0af0434f60624b08a4f4e2ca6eb478b26111a81cdf37670c1. 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/FIBAR2400437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0919a5d6780bfeb4471ffd615fbf9dc20e2dcba4d213ffaccc34a75193ae1ce1. 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/FIBAR2300500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23da4039eed61fb7940b839c2e89cd421f14f585906cf409a2eae1cb1284cf5d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FIBAR2400438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b73b548f8e1f7cafa4d5613fd91b957ab9be94d629cdd3ae23ff55bd9958b3. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FIBAR2400261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bcd2303f73a08a07ab0d1cc5bea6328a357c8af674003f78784ae773b10ea7. 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/FIBAR2300070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9b5ea7df09d11a7abb953001d513cf9b39841fd74101e6e5059f26c3fcd703. 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/FIBAR2400439.