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 0xa189669b90a66c28a1fb705231633a2fa4579f6e65cb0fab2361c62ac4a96a41. 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/a2340a2e-5c9a-4129-a733-0224da4817eb.json and https://artists.proofprofile.net/proofs/artist/a2340a2e-5c9a-4129-a733-0224da4817eb.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 0x47c41205e41636e1e643f506ef4291b3225355c6c3d658353aee92fe95e47bd8. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCACS1612491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc05bbb1bf1dc4814df9bfbe8c639675c036f9bf3f96e10dc2de0aca07be530. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCACS1612492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe934d35efc484b676b5099c54476383e32c1e63320aacabad5664f8d5bce8a38. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/TCACS1612494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33de6a845e7ce67b65308b9e73726af576fc0579ea33b5d970482bc5c027dbc8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:07:17Z), 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/TCADB1716474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d4b7ac32d7af3e66563609c18fcec54be8d163b177c2b31bcfbbf093813e2a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:05:55Z), 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/TCADD1768814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2e8ded65c6af69c246156f98d9433e257155c99f75cead9605a04c2b73e77d. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/TCADG1785921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcd53fa449e58b7a5d080cc9bf236e45efc8386015dd855843d70e8ba2518f3. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCADK1753678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27988cb12f3f25291812dc0c1ffa27d26368536e772db9fc55de5604a835d35f. 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/QZ4JJ1938930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec4efde08aeb10d72c80ed82a1be0d82b317fe8edf0d9461032d977f51c19ae. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZ8LD1957627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f0212bee3e6f74db979e8efe7fbb29e63d12172386becfca936dfbb2ce1761. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZ4JJ1985524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb35748f5348ea811d2f7786a7533af663682fdc7b248921da6dc3655dbc18172. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZDA71986011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b03c017f570584fe7c7304719807e479b0673e403bc5102f3334dc445889284. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZDA71986017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2112c7b8d8b06d9ff367e0c9e0ed28a12052e506fe29b5c7f35ccad82b52e79. 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/QZHN91990601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c54a8da0f8f2f15f06993afc6ef916090a57b53ac4a640a49bd51a89a0943ab. 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/QZFYW2076932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410bcd7e46667111ff2595127780950edd2442c5cb328fed015fbf3ac9881045. 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/TCAEP2049895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03124f031850ab5801ae4b30ce9cd80f3c0f4fb5a63bc7a2364875d1fd04057. 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/QZFZ22067827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024d1d016d33707a3ce4fc61d9ed2d0b5db9c07ff40708d116343cbf7102ad0c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZFZ42050191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc10e03dfe27eedc1decbb58915fac1f9c71b1a8c74cc7a0cc7f643435822632. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZFZ72097669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdaaba37605931b789f9d9c5e9b6320d92060dc7d0b006616e60038da06d10f. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZK6H2008494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c4e01d0e6bf98fbc8161c2bb4c3e11d2140385c5ecc72fb748f8aee6f50a66. 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/QZDA72219227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5486d3630b40d13d68ed88bb22025b512f3268bc3d1e9a86bc79e47e28ee29. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/QZHN92252883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c4e01d0e6bf98fbc8161c2bb4c3e11d2140385c5ecc72fb748f8aee6f50a66. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZDA72219227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9972ad8ef63c2927380e3c91d125e5c6523a303fd0c46a64949c6099124a19e7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN92237186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d35de507fc92ff2d616781f31c0d88683af2b026593c9ad6aff301c5b6cefd6. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZHN92252886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a59ea1a5faea466c3e8ace9bf021c335809da689458264c5e2067f9f28c08ed. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHNC2322279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164cc38d2195ea0c20c5f4cb5ae13db3546d620db43855b82a66183fb96694f2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZES72466543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301a173a47f83364f06da56040cf2d8004dfd6446055c50cacc0d0cac4a7c37f. 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/QZK6M2430873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f6061090bcc97a7bab2a7afb1de6846486ffbd468f6a7fa4871c6653f0433d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:24:53Z), 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/QZWFS2471649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e964203ac6e733c0cd002d7130bcaeeb81f026a1e09874469f8b69b31340f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZWFS2473268.