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 0xf6156300588b6e9e612413722b38a6992d8eace6608cb4554446f306bc8e3349. Chain 2 (Bitcoin): anchored in block 953869 (2026-06-16T01:20:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0678747d-3d0e-4646-923e-77416577ac94.json and https://artists.proofprofile.net/proofs/artist/0678747d-3d0e-4646-923e-77416577ac94.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 0xdc51b0e0ddf440ef712ad11c24c61b2b8c18d0126d0ebc75f633f3e914c50708. 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/QZWDW2302101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f05f04ee686cf4a0073289d245059a2e2c6d6b1a5759757f9c7ac024fe1a94. 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/QZWDW2302102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4382aeb67127b1cdbe331a818e80c5bee5d57f539c44f09ca552669587a1763. 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/QZWDW2302103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee9cb0d473c10e68cf99e7ef66c4e0d41b62156594d2e81e2d9bb52aba64fde. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZWDW2302104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69cdbf2d245e0c1ac8ad5dfede4f5adaeaf2be0963ad89409cb7aedcbc06498. 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/QZES91976105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62150f08597092e34c2ea6bb60693bddf6990e79458ed320fd9222513fc53c59. 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/QZES91976108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97abda20a35e0a14a4102055ac18500250e6459c625b0f4ec84d59ecc68e6d5. 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/QZ5FN1960364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8020f820bf85d143e8a2ab59ca529d6037d08e98416fd3f7b2bc103e66a7022b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZ5FN1960365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475e42e659fd3c7824d5b3eb970f3d5280207cdf501bbcbbc0e6a1f17b0fc558. 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/QZ5FN1960379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b1004f1dda5d9e0b17dc738b72c474aaa4ad7a124f34bf0cf7efc8a9030af0. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USL4Q2369015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea25ddc9e69094320a1a628d1903473e201ecfdb82c047463199d1a0dac8bac. 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/ES75E2303790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2244635b86cb160d729c667362ccbdcb2874e99ee574f57a97c9ca66adea02a9. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ESA011830761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c87579773095099a11d3c2d4412eb64b4cf4b307156207b4e8834b3c52cb238. 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/ESA011830765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe330de1c075ddb0f8c4ceb8ced782a307eddb1f80abf7c834f8f8f7f05cab5e1. 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/USHM22286358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec49bd89d7e632705256c797e523ceb0d3b6952aca2c40060cea2f4318367a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USHM22286359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0e651e1bdce04a7b5742cbebfbacb2c19d2dc2f97b29cefc705553cbc2b23b. 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/USHM22286361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad70e366b8d741a3539390221f185f48865caeec62fb545bb6b4c15aa8e5c6ba. 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/USHM22286362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291d6a556981611e6b94bb05726ba08e5265d1990def2d1ee410edb128b0daf1. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USANG2154053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6710435790fd2430ca7cf54de93e8d47206faf3b482dce040dd7c31242811f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZ5FN2016137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644afb2d77b6f62961f432952b8b4119cbac40217091666df5d7013114497875. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZK6Q2397982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7867fb48f037d0ac69cc6e65436cb6580bf925f934ed7b937424cbc49e88df37. 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/QZ5AB2145496.