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 0x203689faad33be3170df941f4a9ea2b13a29a1e71c7274f18ee4c328e5bcc8d5. 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/ebe916ec-2823-45e7-8a29-968f33f73326.json and https://artists.proofprofile.net/proofs/artist/ebe916ec-2823-45e7-8a29-968f33f73326.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 0x25362df851e4a94becf0ff666542604c581aeea02c19ead9e73bb0598b5c25fe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US25L0501070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9160516bd2e0793a5af62cbd5a4872fc326d1e0c65f60d7deed3bc79ba29c2bf. 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/US25L0501071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31752ebd963ab8ba3c57a779b37c4145320da42de0fd20c7410c34cf978b10d5. 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/US25L0501072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858f9703084bbee6739aa4c423933e138c8184783e1d5cc7afef475ef7eef400. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US25L0501073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d2ee06ef7b1f5c3df49f1e4c374037d91b0641a3da5a806d5b4b542d281ec9. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US25L0501069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25362df851e4a94becf0ff666542604c581aeea02c19ead9e73bb0598b5c25fe. 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/US25L0501070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9160516bd2e0793a5af62cbd5a4872fc326d1e0c65f60d7deed3bc79ba29c2bf. 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/US25L0501071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31752ebd963ab8ba3c57a779b37c4145320da42de0fd20c7410c34cf978b10d5. 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/US25L0501072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858f9703084bbee6739aa4c423933e138c8184783e1d5cc7afef475ef7eef400. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/US25L0501073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac3836e19dba4b85dc2f05336d38abaaa0d12477e125fe5b811bd319c1a1bab. 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/US25L0501074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad1f4974697e4250b54b7108cbba76049b7ee75a39bce5af5411b2aa3175155. 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/US25L0501075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f544d4ea1105a0a3c502ab7bb63247b6be50fe7363f79154971da13eda6e73. 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/US25L0501076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a741aa1badd73d841bc959b648e86811f303e306ecfb56d2c92dc2b525c6ca. 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/US25L0501077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63fd70cf850ce6daccca4a600a80a8a7f9850bdfe11553a0076d94a1f923248. 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/US25L0901229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed8e929ca22413342967847c80ff1d9b18f5eb2d065853165366bc6647c89ea. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US25L1600370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ae4b9fce710f0358e00ec7f5495ea439e29fe1b746eb4f6bf031a87d744956. 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/US25L0901252.