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 0x623900c5e86e63a02f4950eee3db9ac2553b393d83a004bd0503e1ab6a3ea7a7. 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/23e80cfe-e7f3-4a31-b6f0-6619fbf86e54.json and https://artists.proofprofile.net/proofs/artist/23e80cfe-e7f3-4a31-b6f0-6619fbf86e54.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 0x8ae4043ea1bf365e9c193c790c07045fda92f244d244c054c6125820d240ca5c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FR26V1546773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86717e2ff14f35926cbac18066bd99edb76dfc9136e1ecc015f8ce9a3f64cad. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR26V1546775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c55f886e648de1fe3905114d0e0eb4938b9d0277ee9e3d5dcd8b52f1803e5a7. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/FR26V1546780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbca25cb40819576ac1de053ca7266ed3a7bc0036e1a37a9182cc5f414f771d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCACK1558546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d88b759b6347250764e10c8686af6108523b5744ca93e4e827b70f5b6c6b0f. 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/TCACQ1629188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e83c8bec5369f2dd45e63b7a90c213a0ec9bfc530d1aa8c62b815f421947f19. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/TCACQ1629196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8084d93a2ab9b94cf4849de3c31c134c696e2ea7bd335ce9ecf9856829925f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCACQ1629199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37f200bce1303bd14884c609c9c6aa8850be6f19be60fa6c290f3f769d262c0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCACQ1629217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e644d67c098b548d8375d77c7dc93c0a3f591fa63df227e3fd0d8ab05c2e065. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NLQ7G1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fa256bddd2a928ddd43c705b29815727ee880577bdf471145270aebccb7c73. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/NLQ7G1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c0cb39c0bef062963d5e0ad54c08c6315dc9c48cf671dc83cecff6782bd692. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLQ7G1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc7961bafcc0f5a7c8169ba3a463fee188240f43d26199d9cda0fbcd3ee7cbf. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLQ7G1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48eedcba38b9eb929cc00f065b4a3d6102ab89798d45e00af41157060f57414a. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/NLQ7G1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741f02efddca06f77754c5b07bbc8384127a6a417d1d02da02fbcfab7e825687. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/NLQ7G1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f3582ce4c9c3c7465da94d10f5bd7257b14e7cf6694d56a0dae7f292c92f48. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCADL1874084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b313202a7eca73cf8bdfbadb191ee5ddb38af987efb3e2c669585d66a354d2. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCADL1874091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97156cd67922ec22da605cf435af85722c6495da621d95e129131834bc1031d6. 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/TCADL1874096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11e3aa04b50078c57e21ff02a4d758d2faf3b8433efde802d655f11b37d1f79. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCADL1874099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd921f2101de251fddd10bea896ddabf4846a41a62362f12797a3d2c43fb1cef3. 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/TCAEA1957875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7d30b9b278440bfb7be260af56ae7ebe8045267d9eee0ba3d61f71c25e8316. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/TCAEC1992649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41893689ea9c90839d93967c06e71c7bf328d2a6c90856a1ebdcb06d8d176e8a. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCAEC1992653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6e1cc0ac07a65b5579e4ae3adfcabd506d53035b47db531bde6e4e79e9dff2. 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/TCAEC1992659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f823f6cc0e600a17fce8b7ab9fe535df538bdcd6659d10253353b76564e8118. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAEC1992671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77cd7105b0fcc89f16ce86d8e0595f749ca9fb09243f5301f42ec4f264e96ac. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZDA42300802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e669f5bf73fec1e539f1a3ae2fed989d684e8e6ca641979067258efa0b7265. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZDA42300803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae2454bc6aacc999add966768faf4db1373637e5c92706029ec42cadf4824621. 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/QZDA42300807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681ee244d875a96387fb140a57fbc489ce693a1a5646fb76b82d4f89a4596ab8. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZDA42300812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba17c90bec0b93f5ae0b89017be1a693e64ec325ebfb7765e553c6f19bb598e. 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/NLG661700789.