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 0x80cf7ab28136e9fcbb02f0f4e7713220cc832c57ea75f125411bb41fcc0a498e. 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/ab3d1a49-880c-481f-9a94-06408f06a008.json and https://artists.proofprofile.net/proofs/artist/ab3d1a49-880c-481f-9a94-06408f06a008.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 0x2bbb35c500205461d3561ead5f6266003fc10148ade6ffc92decf64c231b550e. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/PLC062118682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e79d3d37e6d530ce984caad10ec4a79964d9c6c3c47859b7a3c88b4f0f5c8e2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/PLC062118684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7135658c793b1ae663fe82ebf43b65c876b040e0090f43511de94fffc7f48a. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/PLC062119052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6166cf1c202bd9e4bc746008aa97eaf92f047368979d6e2026769773dc30542d. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/PLC062118686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f32a83b72b3cf3ef7d7a23672b71f43758e9f0bb3f67b74627f14fdafbacae. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PLC062222362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb39ed152ea17e17f9634b41fa232a6c7d7d8ed749cf1a21712a5efa4f41e097. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/PLI364544580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643f9cd3ff910a91928ae6fcf6b84c4886ec66c86af89170f3d7eb79ccb6cb9c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLI369619620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d74e866ef09c2108befba7f633f095da891ba4c230bd6f127d9a2d2a188c28. 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/PLI365114540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932cf301aba07e69bdc9ef697c02a808ac3b50f5e4c28f408bb8015408a62e7d. 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/PLI360649620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252aab3fbebbda3804fddb84a432f31c07e2aad6cd846e3e9627596e8fc3e4c6. 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/PLI369619660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32c6b7d3e10e373b7be66eedfad0b36bd11113766357da7a2ba1f3cb6d6d240. 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/PLI369619700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d21cfd71c93aeb24c2c3d03b045dd5843bd853f6feb40d2a78d0e03ed28619c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/PLI361443130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fafb488e7488147c63ac2b22312ffa193f26cb05ab4e644b47061b078bf024d. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:10:22Z), 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/PLI366256300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd413d78cfce5b3afc356f214996f483f86e653fb5d02829599d4accb103e88c1. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/PLI369132220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab2c2334a9c07ab378e51967801bc7e660792ba906563ad2e922421da220ecf. 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/PLI363843960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370505c3c1691cf05737c2887cc7ee72dfae45367ad2e4af05e9d68d926ea567. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/PLI368925580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345adf36e8ad56e22b2157851b8ba799eea0e86ec79f224d2ed35c2ffad2f0ae. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/PLA552400238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55dd894c4725e60aa18575da75ae513def2c7f6a590ac4c16fd177a6843650a. Chain 2 (Bitcoin): anchored in block 957595 (2026-07-11T18:26:17Z), 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/PLI368740420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26642bfcd04c03e4866532ab072e82e06e6530a72dfe008b61f93cddb6154cc2. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/PLI366246550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f1f3659a00edf9100686c6f7677acd4e665ab430fdc1d7f3f90bec0e68294d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/PLI360659980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83cebe706cb60ecaf17c01f5446f894e56f8e8b89705a9e013a57b23ac8a6d3. 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/PLI365094970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183c6fd1eed9e303a76a32c8addddc265736c4561e44621e022aa1b1a0600c94. 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/PLI367129160.