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 0x13e9b79b31fa81a07d3af6604034189f9e8b5a166a6ad1a5a6bdbda9fdd12c9c. 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/6d2cf826-e178-4566-8f5c-5508494eeb79.json and https://artists.proofprofile.net/proofs/artist/6d2cf826-e178-4566-8f5c-5508494eeb79.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 0xbca70f35f7d91e4439c82d4bb14c296276fde4ddef18e5cc65cc9f314b8000be. 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/USHM91705302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c86964d4f75d8c32c7ad0c24e0df66b3fea0fbdec9453553738ae844707e69. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USHM91705305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02dcc84c928b94083fdfb5d1812a0e340cffbaa3a8fed39ce6da22dc243f083. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZGLM1909698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5cc102326466d957a48116bf678380320bd547ed41e821c6add3c3fcb8f337. 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/AR74D1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1fa50221fdf25fef81a3bafd49dafa14b1e961500d900973337334a00d940b. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/AR74D1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddbc22500767b5f2f00803968821bb52c8d90bf2e84ae165635f5ac92defbc4. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/AR74D1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018cdf6ef567a629a7555198025e43faa2f861430f8bf1ebf2300148f4653827. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/AR74D1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfcfb3dd9769fec2a050b9e839083d478bf58d53f905f8faa3797e4dc5657fd. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/AR74D1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b4fd3931fb630efbbfdb870fb5a0cecf7a7423f48edd2820b17eb059c979dc. 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/ARK8Q2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98104893c2461902337980e03dc2c997ef043566dbb42dffb012e8855652aa86. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ARK8Q2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603f15437aedb41848a8ce4888704689e3028c3655ea9de7ee31f13e4af086c2. 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/ARK8Q2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf38dfb392e35b376c6f45041cc8cd9007e7b47d2168dcf12d756cf6b1be7ea. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ARK8Q2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4195c4974d253cfbdda8ce761714d748ee919f84b0b69d654af3a4c00ff2894a. 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/ARK8Q2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a7492150621a8dae6b2446d012c9f3c93e06e879ee0545f4ce9890f18b104d. 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/ARK8Q2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb57a922837b2609cb5752d7078359a484c80b3ef52faf9bde4f292a943880ed. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ARK8Q2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9f85e2fa4a7b784981ba58563c2ff44bcd49cb8b34d9665e966574bef83b58. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ARK8Q2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73babb39c7fed62a35e5b384d2aaa8cd37500c58f3d9f7617459b1ca1074fb9f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ARK8Q2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ed4f4aaa6e3b96757d4cc3d29fb3498ce6cfd868db6108accc4e38d7bada92. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ARK8Q2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155454656008257f30676cb60dc49fbdfc5761b95786dddb6132b9bc419f4e9c. 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/ARK8Q2400012.