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 0xc396e1856d9810aabd622a98f5b5eb0efc78d96c8f912e18ac31e5e7145f6ca3. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3d39b432-03bb-45f3-a6fd-ce3d88f45bc5.json and https://artists.proofprofile.net/proofs/artist/3d39b432-03bb-45f3-a6fd-ce3d88f45bc5.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 0x4052f7d3064cccca5d6e4d54d7965460d829a1f3431f6fb6c22c25732b480137. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTB62261391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73f89769a37e14449580f531f2bb565dafd2dfe9ebc7a9654ab6ff738b13cc8. 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/QZTB62261392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830d9e3ea31c257ea1dc9a307ae36085757d53477280c038ed0b8044960fd8eb. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZTB62261393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f8b998fe12318b9a508b2cdf1c986d637ae6591678ecee320c66f3ffce6de1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZTB62261394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe790d70200a925bd3da4f5cd9bc27c40acfd710a1a9bec85150fdf78d891e6fd. 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/QZTB62261395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e876bb567c97ebae4fb31fde2b3c4fb1a7ec95331353af51d98e10a22c12127. 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/QZTB62261396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06302163aa2d3f3d8ad45f38f1f6bdb35dfe5ca2f4f0ba5d877b12eb2551c4c0. 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/QZTB62261397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd647e52e99154caf274d5de58178fa939a65517db7dd0c15a314a8009afad425. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTB62261398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3982ad9cfa238dc3fb081b7b3e51a2915d6e4c6027fd0b94628cffaf98c4e9. 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/QZTB62261399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ebefc6712be6667684709e0491762be7d40bdc948630ea8ab1d98f124dc6025. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZTB62261400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701a24af2b4f3ea1823b24fb97c7f1d3c7c9640f5c32c07584a69055f07b8bb4. 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/QZTB62261401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b7a8cd517fa825e21167c9278203a98f0667bf2f0674aa809bda58380ab99a. 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/QZMEN2370195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33acd16d33978aca85fd78568a6ff567d7ec30ddf429ce8071b0bbfe54f21d6e. 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/QZNWQ2279896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a435c7b402136c964813fb9685436c34cf34d2b7081f8cce895c016dcc61d3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZNWQ2279897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dafd94532af286b6635b02621d0e11e776e827031099367aa4ce9feb4b9f19. 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/QZNWQ2279898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e06d0d6609caacada7e2fc490333c61cfbd615abca71497b400687640d3c7be. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZNWQ2279899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09465f619d8d7c10fdcadee65a7678d077a0e044835626ca52fdd97f90469114. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNWQ2279900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc70fb082e675c41fc77ccb3c9b369028416d87f0dec709e8d3c833e0a80c1af. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNWQ2279901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf028a8e978d9aebc11ae578c73352cabc7273cf71395081bedfa84ddb26dbea8. 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/QZNWQ2279902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0186ed51919b30ad5971ec0cad7d1ddce8754563f399a5b47f68dbd7379984. 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/QZNWQ2279903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432c3208537dcc26228cb349704e75767cb03f699b26c59d50abff27d4d0b142. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZNWQ2279906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5ee48ea92d6140fe6cab7636b0ab4387582980b816f08b09b8fccb6293d6b5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZNWQ2279913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda414d278e0dff6dad4a11e73cd3ba119711978e697810f85941febb3166469. 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/QZNWQ2279915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b33d2731818bd5eec67e5cb4822b9ba2fdc2729ca22dd1a60b3ae1f2eb5a983. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZNWQ2279916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e0134008a162a0f63597c1c921067c15ed561f0eadcb293eb55990fbbff398. 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/QZNWQ2279919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20665451536293b1c8d52c41fe32be78f20926048fc27360b33596b4c3cccffe. 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/QZHN62370968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de4c9c8ecf06a75c73246977a119c9c146ab67445500036c8905443d75fba61. 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/QZHN42368773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd47565fee0186b642a49a2d78f243f106198abc18c10fc7f4789feaf22ec85. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZHN42368774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9515ad1bdfe0d86e8f54814106d8ce10ebef971f4a35a959234e72937375cd. 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/QZHN42368775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b93457528bd115d482fc703371442b0c33b8ccde1df42076580c89a063148d. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZHN42368776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7a541d5128d937d9ecde9ffe6341155b0224d6f84a268400b4c1d7636bb9bf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZHN42368778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x977fdcdfe26c2a9a0d91aa0c6234cec2c0f94448b89f13d9c853c22760ab2688. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZFYX2462322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b1c08302b1ab0b9c3c648066a78f5448485b8b0bb542cd55f059724fd8f00b. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZPLR2270870.