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 0xc59a67c3aa7d12b4e70844644917da98246e3b9e4ec788514812739a95715ee4. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a21e229e-a508-4bfb-84d4-b11fe5924e42.json and https://artists.proofprofile.net/proofs/artist/a21e229e-a508-4bfb-84d4-b11fe5924e42.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 0x37a333d83f6803851e5751c9445889b851b23214349071b0203b4ee1872d8285. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZNWQ2577340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8477fa20c35d3554371938b7aa3ce2a302bf314dbb293bf11ca158e2f52d14. 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/QZNWQ2577341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d16ec863b392695eaa38ff7bb7d3fdb3e6a6bc615128056421865777f32ccb. 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/QZNWQ2577342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd742128b3650aad849c57ea35a3053eb6d3f55254f81d8e99455ac7d6570325. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNWQ2577343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1cdd7ce2e4b5f37b4c3f894faff4afaffa249f2a7052defeec8a8e71123100. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZNWQ2577344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda5c89e9e537f6058c0b838b8e8cfbdc31d185007b9ecc1e9d133557dccc446. 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/QZNWQ2577345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca974983ea785b7ca89241345aa29673799243d9d1f87905ac0a4366714fa87e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZPLS2510715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191ebe7824173933c60eedb0a46a2dbebd6c04f42836f2b071c6b10d7824e7f1. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZTAU2559937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42306fee98c3eb9a501e826d7e5cf388acc28184283b1e924857da30229fd99. 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/QZTAU2559939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f13ec8721ce1e752331e339348883c4ae85f315fc416f00bf732c0876b7e7ec. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTAU2559941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca974983ea785b7ca89241345aa29673799243d9d1f87905ac0a4366714fa87e. 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/QZPLS2510715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4bf53c14725cbb2c0eb757a2747a716197b522124b290b0d5068a4860a9552a. 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/QZTAU2559943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3a25bcc5d78d61b2ea8463a604efde280a44630808790b1ae21cd63e5d5376. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTAU2559944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2553c6d61cd7a57a7ef53904226be974a9ecae23abc72f42382816cb6e70f0a. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTAU2559946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb72b44432895fb731a65a3190aa0a60ce5865505fdeb2b7731a88663c654187. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTAU2559947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f2476d8d8521affd407d523908592a56b3a914358cb9af1ffa4f9cfb58f43a. 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/QZZ7R2581368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd19b4485297bfa85d494c6beb167a7303c785fb3546531b20368903c778fe. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZZ7R2581369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950c5eeef945fcc137471af34123cd1d1a6a5a74954d948e90e5523417e0e32c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZZ7R2581370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6505c80a3f85719db650214b0aac48ba2b1d79f2815d142d622df6cc7e64aef. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US38Y2583955.