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 0x9b31e0c2df9ad3eeee422f794a75a7180c2cd6fa098f951e77173e1eb1097a21. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f727aca-56fc-4378-a567-a6b3df7b2972.json and https://artists.proofprofile.net/proofs/artist/7f727aca-56fc-4378-a567-a6b3df7b2972.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 0x90f228f12eba644cdc98c7f3fddd3e422fe02adfd346294ee3bdebba3ae6fb1c. 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/TWCC32416665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796ef789b4d789ee8ddcb48f1235c21fca2f06d2ee4bfe60f1a137849f50ef7d. 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/TWCC32416668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb906a3d2cef7c0f6f7bc8d524802950cdeb75459a3a5631a186c926f00e00f. 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/TWCC32416669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3993fd10a3b2a3d00338dc3e98256cd50c897e6f349e8d8a2231f14438021e3f. 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/TWCC32416670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334a401f9ad81c4ab0dcc2c92ddd5246099145c3cd0d920c52df13cdc80fea70. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/TWCC32416673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fa035f88503271362f424dde41e628d811f1f8d1f892bfa4fde0e9a73dc8b8. 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/TWCC32416675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2380524a40ab2258244a4713221012b290b051a1681d2499df9cabee25c0281. 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/TWCC32416671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d4f46c940b23964de37f61f9347f17aeaacf4be27687b9d84b70a5fbd38d55. 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/TWCC32416672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65876365234a017f3e7e6686e75579fedb8eca3064ea96d809b9f8e2d7769f9. 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/TWCC32416674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3bf93a13884ddf79d4b1792124d95c55392a4b5a95afe90f9264e62ebd0be8. 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/TWCC32416676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a88b617280ccb5575be12bde37d672bcf7d35f4d07c92b394dc10f0babb6b0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TWCC32415388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb68c2bc0cd66ace04b5548044ddfa2c2711156a73aba3d722a795ecb8f57847. 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/TWCC31804201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd9bd1aa40d2c6cae603965a654316bf167acc26a203cefe17334d7f10f07ef. 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/TWCC32214743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd658894f8d9e95048e354d83284b8bde0844d0563452fb471fb3168cafae4565. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/TWAE31802418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ec0db10992402b590083ee8a0184538ffebb54f3093bb89be7d5e8781b8619. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWAE31802419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f39b7db848f06f0c459a5dbee29609c29029c7d63fd8b90014b03b63a72e81d. 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/TWAE31802420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f19a5574a18af67a508b4d1b86b216a34b06264e4274d1a3b18adb574ec3bf. 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/TWAE31802421.