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 0x94e33847f95d28cbe9438681898d9813626195fef3e70a49b9c1a35580cd2919. 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/4287ed2b-7176-4c9d-aa3b-20294ffbc89f.json and https://artists.proofprofile.net/proofs/artist/4287ed2b-7176-4c9d-aa3b-20294ffbc89f.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 0x9c18ee9674d4f4d14942098b50e363679050c6d8d9a8e239ca3eb324d79f3015. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/MXD782300616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aaaf61b8191ebb211e9cdcb2d7fdc6e538e92c72de6481d27dffc4590ee2441. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/MXD782300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aaaf61b8191ebb211e9cdcb2d7fdc6e538e92c72de6481d27dffc4590ee2441. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/MXD782300130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c18ee9674d4f4d14942098b50e363679050c6d8d9a8e239ca3eb324d79f3015. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/MXD782300616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2bbb3119b05e56f75d35a6f6185595d79cc58ab0d3fa6e6be3e06dd4c32f41. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/MXD782301790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592135c8f9ecd2c5f4a4a4f7f5d7b9cddbea6fc86f48cca2b04163e80b426e12. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/MXD782302145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2bbb3119b05e56f75d35a6f6185595d79cc58ab0d3fa6e6be3e06dd4c32f41. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MXD782301790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f8870bedec76c5ef008c77c4162e4d93ee82e10d3969759e5ebf8119377084. 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/MXD782302621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f8870bedec76c5ef008c77c4162e4d93ee82e10d3969759e5ebf8119377084. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXD782302621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cde9fd74756c1aea5544cb3ee4b3180ac0e3beb730e2f83fc6437beb406d104. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MXD782302242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592135c8f9ecd2c5f4a4a4f7f5d7b9cddbea6fc86f48cca2b04163e80b426e12. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/MXD782302145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2bbb3119b05e56f75d35a6f6185595d79cc58ab0d3fa6e6be3e06dd4c32f41. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MXD782301790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d77561f3fe6d48215f60ba54c1ad4c85d30446551cc8107d3b7225b261c0040. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/MXD782302825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13ae1d3293b88223fe6011ce332fd400c2d98465dc79fd52a1d933fb80551b3. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/MXD782302891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2e9b70e255a6efe00bfe89234424fc1a99ac6edfdd404e1e0fa05a25fc2537. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QMDA62457521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb0e94541293549c73291ac5fdabd10689f4d6ae30f63d1333c0efafd83a197. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QMDA62420291.