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 0xc28aa58126e4202cc7c3e495ec5aa670ac2aa20240bef3fe3360d04026b8a993. 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/316171bf-3795-48ff-a058-31d0b363d774.json and https://artists.proofprofile.net/proofs/artist/316171bf-3795-48ff-a058-31d0b363d774.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 0x9b6624425572313ed4015fc929880eca18e77748255643d5dd8db3a6d0972d01. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/HUAC60502564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1935fde7cf47e2adaf87ba6750eefde2548215ea02660ccb224f4feee7871c42. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/HUAC60502566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca128e9fab6805dbb2f4f8e944f91a9c0b53d8169d8ad5987d177b545b8f340. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HUMAG9300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ba05756c9610758e640479b4ac40194872c23ebf9558a680599c2302edd702. 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/HUMAG9300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf781b147b9aaa3fa1dc727c3dfaeb4a715656b8a6efd0b6392b013a3d232d925. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/HUMAG9300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f6f3c9c0d7ddc3242ff0a61a1acd2f09693cb967d13098e5a93c2b0368a1dc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/HUMAG9300037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdb27ebd6f0cf1b766c424e01d9208a26b29d62a5b0c8363df7faa2d52b7657. 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/HUMAG9300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba044e96b93c203638287886b7e03aedceb6c1ddbb8a5dc56f3a6b6d1ee1f62. 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/HUMAG9300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6038d3294eb1c0f700afe8a4621b5c50696c20d9b3a8bf1068da414378fca812. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/HUMAG9300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa482b5f75351962c2b663a32f790d4189a84605c55828845e6f529963c65b0fb. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/HUAC60503051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc217f671dd913764fafddd89bd9c4816028da5cf018a654ff5b46d859c08353. 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/HUMAG1600362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed672390a8698f00e6215382f5cc518178835aafebcfb03bf530c699b3020b41. 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/HUMAG1600364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02538d2dc1bbe62bc4cb8bcc6f69c815e9cf2ef41f21c784c5ca44acea298c3. 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/HUMAG1600366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b02facfafc594cf55a5f06feb590014609f78d8d3d36f349f041b0e2cd53003. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/HUMAG1600367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ac8eceabfa907e1e43fa15d8b40f39c692fa567a64d2aac79f7771086b50a6. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/HUMAG1600368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2e1a5e77fe46b44b722a2a7237df77815977d62111318a275efc0228742211. 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/HUMAG1600369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507d15815241e5e5ba92e265b899bc2e2a1f2b1f221022fc5bb6fd5a77bfb12a. 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/HUMAG1600370.