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 0xfb7c675ba1ec41bd2e03cb577d412b35158ffcbd327690dc1e325cff0e3d7f8d. 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/687ac798-30a9-4b3e-8ed9-3493a55e51b6.json and https://artists.proofprofile.net/proofs/artist/687ac798-30a9-4b3e-8ed9-3493a55e51b6.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 0xde7cfd49e493307efc039481f7bc19947e2bc91a58dd75ce13be67777b9045fc. 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/ES79A2522801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c89c22ec0d89da057dbe21b07adf361825917db7924e89a6c2a3c3f8a9c89. 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/ES79A2522802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8060d33d0389c7643adfac6410b99d9aef1dd5036bf814d721ca8fc3f72a9cf3. 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/ES79A2522803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140fe2eb897ddf228a1d9c5fb406a8908dec18803e548854b1cf9674ef0793a1. 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/ES79A2522804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e750ccdd07d40a6668f4d7064f932119b4cc0477bfa054db90a04618498e43d. 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/ES79A2522805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42b889a5343ccc84e30d21fcff259826d3fa6bafa8e9fb04006602171b8f61f. 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/ES79A2522806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934214ec7f65d5162bfbab7451e1d2a8052a54e6a16f662f200eb5bd5cec6680. 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/ES79A2522807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23764157b458962b0a8c0476487e2e14e732859224bcb1cba7968fa4e207e0cd. 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/ES79A2522808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2dbd602b89f7925374fe9a9d229980c1a1afbb10284fa437a1d0e608604c66. 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/ES79A2522809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5efef23c5c002a42f57bfb6fc3595ef51be084cfcd0f2a8965efa329c31847c. 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/ES79A2522810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d67bccb8f4e466f4eb59c2ee892596c07b7285bb61ebc1c006411046ede1685. 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/ES79A2522811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d911aac96d4ee32ba2af84d01d8621f6a265d49dd342ebbfb9b8a2c92f45b64. 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/ES79A2522812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140fe2eb897ddf228a1d9c5fb406a8908dec18803e548854b1cf9674ef0793a1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES79A2522804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e750ccdd07d40a6668f4d7064f932119b4cc0477bfa054db90a04618498e43d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES79A2522805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d67bccb8f4e466f4eb59c2ee892596c07b7285bb61ebc1c006411046ede1685. 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/ES79A2522811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d911aac96d4ee32ba2af84d01d8621f6a265d49dd342ebbfb9b8a2c92f45b64. 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/ES79A2522812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0945756f4a823b46f867b7ee9f69eab3b8f861f327751b3b97b52eb64e400be5. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ES79A2523001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e44d378b79021ccee8752882f616b7aa38e38e91bf9c653184dfeae258e381. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:42:28Z), 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/ES79A2523002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0945756f4a823b46f867b7ee9f69eab3b8f861f327751b3b97b52eb64e400be5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/ES79A2523001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc96e203003f7f41bd016e9a805abea8aa38c5ccedc04c0fc25ce4b4c3b3dce. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/ES79A2523005.
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