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 0x4f24442337edf3b02f72e37587ea0396012e920969ab29b18b3f0fae44780576. 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/5f4b78c9-8290-4cc6-be20-9e3dc4319ce9.json and https://artists.proofprofile.net/proofs/artist/5f4b78c9-8290-4cc6-be20-9e3dc4319ce9.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 0xbca0360663301bc7d7c18e20fa26abd5bd53e1ab7830512fb9f07ccf8bf3ef02. 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/QZES91837163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cff5fe3df2ca1b96cf0e655d9bd7031600cec661f3e87da53b802d10caa210. 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/QZES91837164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97e370c2f61719d9cf5426fe3a393f7e7c47feead3dbbba9413595a837f5149. 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/QZES91837165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c69006dc52c2f9c315d2f2f25f3be52c5d0d4211c5c463ec57505f591be1cb. 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/QZES91837166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb11285bc0400944f41d6109d4d4927bf3b78b2e783f8c0fa1bff5ada85c8952. 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/QZES91837167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10a005ae71d05306c65a999c261bbcaa9ead372d32ec3ccb2dc911100064f42. 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/QZES91837168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fb74cabe788c307d241a5189b22cf49d4776a1182e52808a2d4e9ef23fdd39. 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/QZES91837169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de1fe92232f9c56c51795486f4b6d99276dbd99f2c5b4860496948d46dee20e. 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/QZES91837170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152863874a5e52ed87c5109140f43522398be188a3ce2b6b24dc73b40293c8f4. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZES91837171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5387314aed42ab45fbf821698ed5e80b32d1775624541812e4796201e35e483c. 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/QZES91837172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff510cabd681e8f5531ab2b5654dba813c67c781c34d7f95ae357261dae3bdf. 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/QZES91837173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7678d6a6302306f772446259466feaa3a222e9505ca5cd9e3290ae0a97d42e64. 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/GBWUL2343817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84660089cd910ef5e44ccfbe3675ef7dc6cb50b3571ab270f56dc9c09fd1472. 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/GBWUL2343897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539f23454697996d6d4a035c82e00621362f15cedea1ae23512a7b60f0a53be3. 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/GBWUL2343899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd93f1d0ba744630b70319265d1a3982e4f4d36458f7c2fec4cddeefc8e15543c. 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/GBWUL2343900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2293921d630ef372c7b85e9ce05a545e594608393fd5ee397dd146d57b49279. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/GBWUL2343901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48487845380a44aacc0ce1099599c6d7f3d321fb25d5c48f1c2376d33d50dec1. 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/GBWUL2343902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324407b6ace71f599683c36dd7bd387831da5476c03f4b0eb6b806735941904d. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GBWUL2343904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f112913ccc4e5a75c6cd444404e1de92546cb2e4a90f111e020216d2b0b9ad1. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBWUL2343908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ebdf4ed4ce9a26a8dfa94cc957a5a0a0805c7b79fe195c3df6e183539523ebd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBWUL2343913.