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 0x942e0c166cd312568ce5d38116c107f86f470780b2b5a231833f4734cba3f184. 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/e7f9f520-63d8-462c-a3d6-815abd13934d.json and https://artists.proofprofile.net/proofs/artist/e7f9f520-63d8-462c-a3d6-815abd13934d.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 0x7321218b8db67f78a3bfa935ac4a1bf47e231f8149a2081ea7eba5ff5b688846. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BR03D1801086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e08c98782fd50cf357367b28805a1e31c5e554a76044001231474422f1bfaf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BR03D1801090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa049f0a3d2d31e3b47bf92f3b435363f06130b61934154a4495700ed1a75a554. 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/BR03D1801149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd46d7b659b0b16294fe1f62f54d2f4791f827cfef337b97b7d107c80d579eca. 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/BRENF0700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c0c9a150e60cb70d243a3c7ff9675c4b89353724fd57b44a7a739442d3154e. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BRENF0700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1bf3dd1ae630e27f449832340ab80de4795955b42005ada62ddafb3cc7af08. 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/BRENF0700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3620126ccaae97777dd154d0e0f800bf5100ae94d3de87767564f6ac64575c10. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BRENF0700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500a2ceb48ae0d6a93d1108e1dabd6b6819b6d4265e7a53d1d314bcff90f4fb2. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/BRENF0700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b0c29d01f97771699267bfa03d7db2c199d77c61a8c06494c8c672ad7497e0. 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/BRENF0700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11555e09deb4c1a7f877537f8a39dafc7eb7a338d1f282f5a76f9d2e024ec6d6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BR03D2500636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657d8e000bd1eb945e2c6e86355a4355ae8e5bd800004f4752158202c70072b6. 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/BR03D2501601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456b07fffaa836a64180f986376726bc84c9a152c4fa694e780ca7117dc64178. 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/BR03D2401711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa351853e505efc64f220b2c700095eb907e1ed30bef39a74774fa84bb36bb6cb. 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/BRSKY0300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ebe7eadb2d32fac339cf7ae47ef09dd8143ab832ee1cdacde1ae06b84ed5b2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRSKY0300655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57d791f6926a81dadd75e408334e18654fe3fe3210446fba94c1d9086fb806a. 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/BRSKY0500653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4270c4c285ffecbc5f271b0cd5a02bc562c0dc121037714f14ba6a8bf5a3cf34. 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/BRENF0500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e6e587bd1b1043eaa3e9548c491867fdefa7af4ea8b83d4e53c422e5124ec3. 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/GXF9Q2442181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9585c8173e7976fcf383bb09aa97e1e9bc02c230f4b201b812983666ed269575. 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/BRSKY0401532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddc31b03cc7c107f4e5f098fd6389c8c0d4f881f191f99fb4da779bc0ab756c. 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/BRSKY0401533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456b07fffaa836a64180f986376726bc84c9a152c4fa694e780ca7117dc64178. 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/BR03D2401711.