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 0x4319c3ffb7835ebe64d0a773a7da4a768af750ff363321f36b02d0e85d3bac9f. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bb45e69-f576-4c72-83e9-5513d4871632.json and https://artists.proofprofile.net/proofs/artist/5bb45e69-f576-4c72-83e9-5513d4871632.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 0xf23ad9575cf26efaaf74d00083e769c64168dd4df98757ea42f83c559d4b2f5e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FR96X2352208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05564c94f100fa6b2406365a851eab95cd3c51a530eabe149305cdf7cfe23743. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/FR59R2313970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68f22d62adb05fd9f1a1a31e91565c941cc11228c7d52a1e4fa43be9d4fafa5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FR59R2313971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe323373843ed3e875546787bf8b054882f8dba6bfb299660d7f0ab2a87745b4. 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/FR59R2309836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d2739f006f2f778b423f88b919f171be946ce686d15eb9468e0d09e1606fdb. 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/DGA0L2419431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56495579f446610159783c5495aeb1ba24fdae5f7d4556cae2886ba3c891e50f. 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/DGA0L2419432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2436cc8175c8e5fbe2688400cdfcf0a93cbf84ff6d57779f14c66be3ca5428f0. 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/DGA0L2419433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51fe292a0e899a7241d3ac39c2b3c4034e87e5bdcbae33d5561b168a54918e59. 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/DGA0L2419434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44903d4104327a2a93802c3a6f59783001b10d13c9c76cd563580154fd1e5e4f. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/HKG732271421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d9d1bad48447ef8715c01a64fc168e223a3b1916cfae3d7e34737cb667c1b6. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/HKG732241521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db065c518674e918c20cb7cd22cc1cb754c3fee0162c7622b5a7729998bb016. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKG732225162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb393d28c27ec8175e15adff19593616d2e68788ffc42633e7105eb0d93a8dd1d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWDL72203484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fae0feaed36f4659a9053cc04603550853b94708d4b030310c807439ca592dd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG732112596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029ede5f8330d3651e755f108dfff4660ddba1e74e5b422ea44472ee8c96ccdc. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKG732107873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94a7d48fea41167f6e879cc48de4085771b5327dac38e1f8e97af28c747dfba. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKG732104512.