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 0xe5ed7c23ebb08a732af3833f5c66fd18bdd42088c793c9a3bc054d3b97879d99. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c07ef220-c257-4620-af24-38ad53356078.json and https://artists.proofprofile.net/proofs/artist/c07ef220-c257-4620-af24-38ad53356078.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 0xc865d0f26d56954f0544b6730e60444873e8f2cbf85c685279b73eef45ee9178. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR7P01800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6924df27da46f87745e6aa05a1b18c92a74e755cd5d378a6ad9f7d168768b421. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FR7P01800150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e868cb18dd2e821e0901077e8cb4e2801ba8168f1c0d5a63c1d336de4a169b2. 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/FR6LF2115121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fdaa1bbcda50845fc5e0ca99fbd025b5525336e1fb1e36e818558afdce78393. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR6LF2115126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111f748c962bdc3ca305c80644e87e06bb127104eb290a7bf3c57b502d8b5735. 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/FRF251200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee41ffef15c91e8e97e864df0b5b149bda1a36aa43aafa5368a392a1e2f5ddae. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRF251200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200e1ea65197cb1d2ba91ceda795fd1062aac109966c079ecf9bd6d0476dd44e. 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/FRF251200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eeb4c89205ae6982740b2f6283fc89c04c9743ded363f14f4e3b3a74c34c43d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FRF251200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ac9b12f152e5b27faec1037a5789f68698cd9345763508047f4e9576652e76. 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/FRF251200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8688dddc3c2c1f7462407ac2f49137b46f8139fae44961efb309f6e55a4c6280. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FRF251200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd950d9de76a49071f5356e5a1108389a5620935e820f401a4fbf6e43a3d0c9. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FRF251200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9164416e465a3c7dd50798036afb5017aa0aab825774972e403b0f7f5afab5. 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/FRF251200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730e8cda7e98a211fef5b544dd085496adcacd5612cbcb5395fe4cb1af824115. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FRF251200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae55b87960fd3bb6eaee80d41757e1b6238b6cfdfd0e955547a3bc2d959dda0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/FRF251200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200e1ea65197cb1d2ba91ceda795fd1062aac109966c079ecf9bd6d0476dd44e. 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/FRF251200003.