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 0x61158c31c2d3467d8926b8c51d6e63654dc2fe54429bf7acd98e6e2b99706a31. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3522eaf-a5a6-4534-aa9d-00d6154d2d43.json and https://artists.proofprofile.net/proofs/artist/d3522eaf-a5a6-4534-aa9d-00d6154d2d43.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 0xff6489de45bb285b45bf309960484fc48f4f8ff88171517d2b94b9c0c7af62d5. 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/US23A1500786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ef58f021c65fc254e69ac4090776ddb794ec0835397566eb1269ed151d202b. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/US23A1500875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe945fe179b926ffad12869c51f5a14a75b6b207e0bb31d1d083d0df91839ab8e. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US23A1500983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cea3b75b435e9f4241cd4d138d6acef9f2c5f814e26a111924a125864b41250. 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/GBKPL2205794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2206619bc578c79ede15b93b6252027c09f12e3acd5a33d9b7c1e373912961. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QM4TW2385570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2206619bc578c79ede15b93b6252027c09f12e3acd5a33d9b7c1e373912961. 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/QM4TW2385570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7a3fe099aa1830ac6b09ca62dad3e46e0ffdc2475dbbac1df6f5d943f6ceb6. 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/QM6P42311002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb959105dc94275eb0c055153c97440a4c5a641131df85e719c830c50a4bed6af. 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/QM6P42311003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d0e41ebe4a2b70b1f0e3f3ee6e5b87e121023cab6f173ac02448db15bedb45. 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/QM6P42311004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a11e820db6fd9d32fb6f05b7d7abcd9d8fd279efacd254dcdb07a929fd3d02b. 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/QM6P42311005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e55f9e0d3ce63346b6ac74d1cb9455811b69aad148bf600b35000698ad2f2d3. 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/QM6P42311006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bef8566bddea67c36381b06353ea22bf39ec1a4434b19f7404878768ffeb7a0. 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/QM6P42311007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4d83e2fd6268aa5468a807e8664915fa0c93033d81132a001917cd76dafe40. 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/QM6P42311009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x396428fc08339f586c5c83e29daa6a23a9d0a7ea78f9fc4f8bf011ff8db14103. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6P42311012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1a05f2782d9c7089de689b0c59899da5097e221e805074166a219a1b036ec1. 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/QM6P42311013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33ef0fdbb8dadef0f857df18bad809806f8053624db363c1e977282c830daef. 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/QM6P42323062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee04fcf830c660304dc41e851e5af2cdc4a133b27940ef3b37295eb7f7894c6e. 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/QM6P42311011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5528f7f579fc5eb9dfbf222712d310419e2f63223255556fe6ecf1601a58cf85. Chain 2 (Bitcoin): anchored in block 956960 (2026-07-06T23:19:16Z), 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/QM6P42311008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2843da506ccae50557fda16365f4d5b0d4a9993e7fe1daa4cd33af02c305039. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBLFP1722266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a8dad96ffec42d5559bff174815415ea5a53b6152cb1775135c9ee770b58ac. 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/QM6N22339013.