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 0x358f6d0ae8edc044ee8413613622cd6e41975029a1b8116e0045902963127ad0. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a61fc79b-3b3a-4e96-bd31-aa80bcaf3811.json and https://artists.proofprofile.net/proofs/artist/a61fc79b-3b3a-4e96-bd31-aa80bcaf3811.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 0xa6380aff3e0fad4cdf1f90c4ebaa3ce4ce924008cb59f461109b69e4b2a00180. 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/QZDA42476382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8769d29b1f9a7996a821d32a243d63834bceb137225901610e0128cb078dabff. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZWFM2366769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38521fad0752ab440e7ff83f6f503791d8c2eaf8a76794a932487f2ad5bf42be. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/QZDA42476383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de53c3c24caeeb569b5cef867dc3c09c74d4d50098cda75b196f8106277c9d0. 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/QZDA42476384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d3f1cbdc0defaf8f178cf68832479b101bf7f5367492c0d7af7c61a1bc1c44. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZWFR2341691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8833f217123c52cce46c5be41ebc4a09e6206d7ea5e3960e38ab09dbbb3a9110. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZFZ32424830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29836e2246379f3ee2bf1641e6514bab71f59a1fef20b7e349dbabcc7b2d627. 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/QZDA42476385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163a70c42049c37333249b4bcd66aecd8d0231d418d3ce36f1674f102b53f66f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZDA42476386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce09b0b784c83fc4f00eeaf1e5e3b916a9be600b587ed47846d0b95ecdcea577. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZDA42476387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48563ca4f7677ca7d478f812004394be517b91c535e2c619a202ffd86841921. 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/RUA1H2122334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4d739ffa50b394ecac28463a66180de1d163b87aebb399cdc2021f8efb0527. 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/RUA1H2122335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec3951653b97f310e126d6bb0bfebc87f2653d62e0400f3a7f77a8ae12fca95c. 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/RUA1H2122336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7494e56d61239b36026ef8891c3ac690abd2db854ce0459cfe8502a1873a7e60. 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/RUA1H2122337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd7426b720daf197cd83615f72cb757d63ac4c63fc744ff797f227e575240cc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/RUA1H2122338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9134b4526f38520a62a4a95aa9a87a3f9f9b6dd70ee442c302f1db5786c1fd65. 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/RUA1H2122339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531515e0f46cc23a7923a6788266cb69b0e76e351ecfce16ccfbf7d53407f37c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFZ41992276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7004c5ae1154805067ae5cd827ccc2190e424e1cae5141b059535c85a69aec. 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/QZFZ41992277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdaa8bc3f341e59a1223fc3ef88e57d331800ef32a82444e2705f7d64c78a8f3. 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/QZFZ41992278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1e377c322723250774813ea9cb18fb46da2c533697c015e697fb302f480407. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA41942341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf12801102e8a30bf7167914e6049dc876db2adaf2376f5b6436927e82a8ca949. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZDA41942342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06beece82ff246847f2a22f07fdf3ec08613e04eb7bff003e98531e4d98bc79. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZDA41942343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9da0cbf6d7f3b567e4232ee13aa2cb243f123a5bbcfb3e6dc01ba230a7ca54c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA41942345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad440e1faeb5a2668489d9571cd5ee18e15cfc38b5ec10f84d0c8fe83aef3c53. 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/QZES71857415.