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 0x0c0304fdfbdbb630bf2096b661394b93226cd36925911cbf9144cecb0c6aee1e. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ee1f1601-ebc1-4ab2-8761-c944f70fd3b3.json and https://artists.proofprofile.net/proofs/artist/ee1f1601-ebc1-4ab2-8761-c944f70fd3b3.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 0x71af9200aa9a9aeba35ebca0c706d12c063b92e7281f12de6c85019e6feba6f2. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZMZ92170208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b22d2d21bfe04fbb3d7185a478c42f2331074487b2e0c3d5248731851307593. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZNJV2246150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d520862ce29cefc91db5b05d9bdfc68268b9aa50bc72ec19b0efa071c8a1f2. 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/QZW9L2255966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a71729dd604fbf746b039c8b260514c21d963c7a74943400926dc96ca03c5f0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZW9L2255967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbf1d8b51d33d4ede26201f9227700f815d3ba18c89329202359b91f7ec1181. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZW9L2255968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b3a2005e44349175e2436d88a0f4910323546413d3b05375b6c75df33a9128. 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/QZTVM2274802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75920ab3faeb5106372527e8c63a5b1af8a8aba9909d9c0b332c384a0d52594c. 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/QZW9L2255969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb243ee72317267a6109650fcd0f691007715f35f040056e3448c1972a1143bf1. 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/QZW9L2255971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8162532e44ce048fe0b9713edd41d5fa01929fc17cde279474d9bfbd2a3692. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZW9L2255972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2512a88c8be1205af0934a8c093d7ffbf644e5d34a7744ca83985c932c7726f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZTVM2296091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af89f729ce42c9f8fd14f70f50faa11bf4732e18ff99b53689f2e57f948296e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZW9L2255973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce69722c75a194217f9e8684a53045e5fcb81eda11b637234951524c3a04ea50. 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/QZW9L2255974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7aa38afad70316c3a702d866c36e01884ce7aa8c4e4adf6d941a9c0889eff18. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZW9L2255975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee3e26e45e5feacd56727bee280746cec77ef4003f3d70bf949bf5c1a66e9bb. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZW9L2255976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484c0d59914779fa7ac357ff71866a4ea39126d904d0fcbe8873ac891ccf5069. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZW9L2255977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc38fd5784915b118fa70e8569933a7750f869ab87f23fe1072896d213d5c1a. 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/QZW9L2242550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f50994f0e3344db0a503000935a166e622cc819966a60c88e3db5d412e42b1. 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/QZW9L2255978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7debbd7e4e5d111be8f689b4d5f42a052e597f45f223cfb6fa8a7a4e459bb4d2. 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/QZW9L2255979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd69c4a2c4082c46c0624d946312ba3341bfad247fe7239fd9ce3293122ea6a3. 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/QZW9L2255980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34aed581fa1d4c210cdf1d6fa9923ad1491738297aa07ad78251f8da11b128b. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZW9L2255981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca32d2241a48bd827d29bcfd50caa265d53e6027f0aa27dddf20ff4e28560cd. 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/QZHZ32120744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9ba58dcb1904a924a825fea01bfe94d2ecdeca7ce8dadd3d92be3c70555de4. 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/QZTPX2291180.