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 0xe0c194ea74a2c0cc29909a61f8dae73c5ceecc6929439f97ae5ac43c6c644526. 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/936e6a2e-c684-4111-83f2-f4ee5a7eb60c.json and https://artists.proofprofile.net/proofs/artist/936e6a2e-c684-4111-83f2-f4ee5a7eb60c.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 0xbd9d0184568d8935cb3756ca64b2c96efc3639a7978dc6f6e76c11ed2f0f03aa. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEQ022008042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf914cb1f6f0fb03cdee4c7b99e09ad440ae8b14087c27b33e8b20ac89cd6e65. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLX9G2100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0748d7c5b18a5efda5bf15396714965d81f829531e93c94179c9565847c58ad. 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/FR9Z62100207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93744e3954569b21fc72c536b0d9eb8b697c7dece69677c2ff743e8f7fd277f. 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/QZPEW2104583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c398fdbbc773d6a83df9013450ce7fe50dceae8517f4e8f92bf4f17539619b7. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/US3DF2147725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae626b42a52544347a96e26c2593ad31c6a6b623becb75fe1693c1e1c991d49. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/US3DF2183407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a18cf8a0b9dc5373128d6594e08f51dbd41f526b6b5e74d5e99dbcba7fa2dc1. 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/QM3DF2120173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe644805d767e7ab327fd8f602c68dc22671adc4c425cfa80122ecd698d889f1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US3DF2226784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ceb7f90f56e213a6cdb21b68f0a1d88dddd1e756a5cced36078f8b4fa148417. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US3DF2243845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e5ae07066ebb5cc7b92d8ad6ffe74b3e735af25e7baf2a763cbc32c64d2232. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3DF2273123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294b373b41328f23d48ef766d80af7a075cdc1c41f0929bf57bd49dba7efcdff. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/US3DF2281625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68401d58c594550cfd692535d6311fb9bde20b85b171fe0446aa36786d4994b0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CA5KR2297788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4e01f55693f407b42d99639b9966adf99bed63752903a93823ec76634fa42d. 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/USANG2263017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4e01f55693f407b42d99639b9966adf99bed63752903a93823ec76634fa42d. 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/USANG2263017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88293dea0e9aea3cdc3637e6da06b6616fcf255c5dab6114f91f9616aa05ee3. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QM3DF2243557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec17cf9a4150ec45d98a5cbf320c9c8c0a285c3d724a37b52d3bdb08e675d120. 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/QM3DF2219104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4383ab3756aa382b6fb71a7291104446bbac509b7bf76e9e61a32767f2c125e1. 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/QM3DF2262424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d41b5a63c7912d53517da1b67df6374679066330fcf5182a018bf632b45652. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM3DF2262429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x030140a99c16bcee876a00a6d55344ccd2ff596e7bbf58bb3b92224ba40e43b6. 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/QM3DF2274963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4406b79311b3b1edd71ebcfe45b62fd198490daa2f245839f3cc4b7d88aa9ce. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QMR6U2400108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ffe7c0bd909fc2cde5ca45cbd9087b6176ca5ada3031207d568b24e55c5b8c. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/CA5KR2472669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ffe7c0bd909fc2cde5ca45cbd9087b6176ca5ada3031207d568b24e55c5b8c. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/CA5KR2472669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07074dbb67dd6339dd7214645193c888e1819bb831b32678df2e33abdf1f173d. 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/QM3DF2174083.