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 0xf8bd8ea0982ce44907fa3cba39b5c29e7a0dbc68038d7520b90ab817f1efdc8f. 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/bfb1699b-0767-40b5-b294-c02cc57373b9.json and https://artists.proofprofile.net/proofs/artist/bfb1699b-0767-40b5-b294-c02cc57373b9.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 0x37726f6fc1af63a6bc960d7a7fb08487a58812c0542ee496976aa130640e9b9d. 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/QZHN42203231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686056f7bc456f583c8bbc4825225b95e4350f9a4a976b5f93f674226f221d1b. 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/QZES52420466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc88c273aae16560bacfbc5de23064e0234fd30caf84c1b3aa15996756ddc18f. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/PLI360323920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52e6739cd5a97697d3e848d545c37c3cfd114030ae6a40182e0ec9b9ac04a21. 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/PLI363944850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02389ce53cd0786ddbd9f1f62bd2f46c040fc1aa7e0390825e372dbdb62f1afe. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFS2404346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb370af4f43a4323c3c386f33b0cc35b7343d0dfd307204b4c64e2e994658d84f. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZWFS2404349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5b24b4839adcb94d63d71faf33ef9b0c866342f23f01422385eb8215496d87. 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/QZWFS2404350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a488e75e4d3e61216b9fedb3741864f0f95bf1dded7384497c4c365dd86e03. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZWFS2404353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6ff9ddc37d987d3e6af7f44de91bdae68d3c0ce0523d32f08e8eec66c26944. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWFS2404357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258420353ef070aed6d03d7e929c80db613acbd55c5aa9914b9b28db9f624506. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZWFS2404361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372e588183a414219c5ed6c74accce30a86f3cbfdfe68eb908aeb814c67c81eb. 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/QZDA72522772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372e588183a414219c5ed6c74accce30a86f3cbfdfe68eb908aeb814c67c81eb. 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/QZDA72522772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb398eab87f947eebb99aa0091518899751fb9362fc72f6b25dbb86058bb9b0. 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/QZDA72523887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c653b77de3fcc97b939e975a0cc630c463b86f9d1e17b60295e550c2493515b. 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/QZDA72523888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cfe50f3d824a3ffddea6dab69ee10806eea94f4865ad4df9baee63fcc913c3. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZDA72523889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda58a9a913a3bbffdc0f10c0cd2a6456945ea9788b98a3faca3a93b7c2bc8bb. 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/QZDA72581119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f321b1c464946c2f0dc5e6fd3f076248d4ae7b45fb77eaf96f82496463d628. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZDA72523891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8b4a690b871023ed73d647ed0e2cfb15f45fc45e06199f0bcc591a8368c61f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZDA72523892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3416fe272f44d925b28ac4ad3aa3de7878a2a7b0d8492663d0899cb1f77294eb. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZDA72523893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5351b76a4724d3a33d8d325559dc0ca23b4e81fe34e2e191641e4c0079aeb6a0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/PLC062526844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d9428721010098b933e5e074799a00aa7aa023d560dea02f7b68009e411e91. 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/PLC062533331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab50f5eecc5a73d993b9492f24364675d0049e2231a89d76aa9ffa38ea0eef18. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/PLC062550042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5496523815f34a2ea9c5ee758b022b22ad277b2216f1a7f7be533431226be2c7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTAT2439623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0561a444b685b8f501ea7062cfa8ce3a0be0bb61a5b0106e30ea194ec6fa2d. 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/PLM402408300.