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 0xff84ac95e0da2501f5feac4187c7bc6cc14421ff9421b1be1203ca066880d62f. 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/073967e4-5e2d-4530-be4f-79a47a1de0ad.json and https://artists.proofprofile.net/proofs/artist/073967e4-5e2d-4530-be4f-79a47a1de0ad.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 0x684331e7766a6db9469bae97a1d3fb24bf8438c9ab274860141d1fc2e9de6573. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/FR10S1776873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f08a4d7595a63bc2ef3fe9805e151717222e21510527622b8697050e10793b7. 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/FR10S1776878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75f04b862839d7e5864e52add8b901ff2fd8c6ba3adf630cd392f0b8851bf48. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TRBMA1802507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0309d3128b62cb61252f77ecdcc5fc88bdc2e2d04ea9284e4ff75383fc0c3910. 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/FRX201906563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413f6164383028bb55c8b88581055776bba4762846d7dece60c02322d8cbdf55. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FRX201906568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33749abe87fe18356d2723e1d3a1ec6eea31384d510c830bf91fe7c4aebb2f89. Chain 2 (Bitcoin): anchored in block 957697 (2026-07-12T11:22:18Z), 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/FRX202255410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9259d484dc87bb3896284ea04f3f3b48b6f267299a3dca66b049d7a148533e49. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DGA0H2303633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bda218a095bd4605bfa35534f739cdd8a24ecdbe81ba60f11d099cb0c57ef1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR2X42403174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee759963ef1a2078d4fb715657a7e5344e9010f7add812f136a75d01d6aba90. 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/DGA052449363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fb6e24ba73f75c2071309d612b3a63312dcb9be5ea85030cdb8cf533a69f43. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/FR2X42548011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89716d266538e5575b04be41118e845244ff8317a826bc4112a655be52cd7cba. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FR59R2586384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3da17d3dfe0a99b9ec6d1fa67b13afe75a629362d4c0a031de85c1789f81cf8. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR59R2586389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe620c6a0d704c97c162556d44bd2a84f92dbcfc409125359b8d53f6fb9b0ca0c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJX2581833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ab3a2269a18673cf8ff89104cb4cd56f1cc1a75cc4670ee3e15a3a86994cd4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJX2563637.