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 0x07e21370f38bfa47e4d174ea7d9775580b89401a5e1cfa7cb28028602f16c9f8. 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/72d191e8-5318-4af1-be2d-e491ab2aeed6.json and https://artists.proofprofile.net/proofs/artist/72d191e8-5318-4af1-be2d-e491ab2aeed6.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 0x0e1a1ae6b278d6af357244d22c41e4380544e002f3373fe78c1d2121f286acc4. 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/DEA622302175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ef261a252f2e8a23938ee7725bb89d41251466a762c46b23d3cafbd3d6895d. 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/DEA622400091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1a1ae6b278d6af357244d22c41e4380544e002f3373fe78c1d2121f286acc4. 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/DEA622302175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36fdd98898a4e1ace112f1ecee4c045e187fc4028bee0d5690945c342556c7d. 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/DEA622301303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afa0b755a9757d8949448ce539f07d91e8593b4ef0cb62a66fa975f6c28e492. 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/DEA622400949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1a1ae6b278d6af357244d22c41e4380544e002f3373fe78c1d2121f286acc4. 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/DEA622302175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36fdd98898a4e1ace112f1ecee4c045e187fc4028bee0d5690945c342556c7d. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEA622301303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d1dd5873eb3a7a6b516c3d16b98ebef92271d31aad025c1ed978d03e26c47f. 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/DEA622404181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1a1ae6b278d6af357244d22c41e4380544e002f3373fe78c1d2121f286acc4. 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/DEA622302175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cea04d6ca6b1ee477fca9bd1f88371bee47a89caead169b739ddbfdd3576be. 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/DEA622500252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afa0b755a9757d8949448ce539f07d91e8593b4ef0cb62a66fa975f6c28e492. 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/DEA622400949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23cea04d6ca6b1ee477fca9bd1f88371bee47a89caead169b739ddbfdd3576be. 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/DEA622500252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afa0b755a9757d8949448ce539f07d91e8593b4ef0cb62a66fa975f6c28e492. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/DEA622400949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8facb770b863a7b66e2c6f3ef18b5df05889216e167fa642e1118af03452f672. 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/DEL942100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1a1ae6b278d6af357244d22c41e4380544e002f3373fe78c1d2121f286acc4. 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/DEA622302175.