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 0x98daa49d5aeac0c91daa88f0a8d2a8cb4ff68aac51f927196f320ef3836e3246. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e52a96f2-f01d-4e15-bc73-9ed7abe9b428.json and https://artists.proofprofile.net/proofs/artist/e52a96f2-f01d-4e15-bc73-9ed7abe9b428.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 0x22f27873a8751a0f678d8b34c0cf4f13d2b09114c52f877619fecc3ae4fd4f5f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/TCAJH2554979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0861a91093a9e2fd3b0e596ef331b216ddd9f5f086b887f5633d19da524959a. 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/TCAJH2555003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e84baa8259138d0aa5b6e2e26edf2e24eace71ebff90e26ee19ab884158dc0f. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCAJH2555653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09da535bd6b993273121bc050e5c79be53f4c19bb29db95f16fe56f176750e6. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/TCAJH2556117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9898205fa8a8d99fd700bce5d147bf5f17d60f4ff8a2def67cdc464b75d318bc. 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/TCAJH2561521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c722437212265b440fad1e046f796f41dddbc1bc8b34d51e6a2474f58ee777. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAJH2557843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x401eebf3affb69a0d6e2cb72d15b313be303265706c362dc919cff6bb6be6461. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAJH2557860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f153c4c192f2d45a45349b738d6a0c08c494459f31f4eca6cae14343ea38b7. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCAJH2564057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d770ea502049417eabaf65f3ea7910c8b526752ebf732b337db3bf6ce131e0. 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/TCAJK2566294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c4fe752ca1a2bdfc04c4052e5724102940dca195d27a2f796531ec2d1a78c6. 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/TCAJL2578752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702312886b1b269bae811f1b8659336a1f55fec59af8b1b74007fd7416ac5e4d. 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/TCAJL2570342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3804f601d0ea3dbbc40630e8a001c13b52d9a33dd86b444094e5f439ff4a9ade. 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/TCAJK2567920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c6690fa739fe58aee987d64746bc030f4282f1852333bcf02765fc5f9211ef. 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/TCAJK2565727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fb1fe0b0959afda3f9e158fad28f59c2295af9a5c595c9d80109e7e0d72e46. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJR2568851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901560f00a0e09c9cbf32e55a1f0654abbd85cbc7b7eaba2151882bcbf97d31d. 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/TCAJO2542474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c20261444e9c44b88042a4666d7d51f0bc9abd900248b3b8a5ceec3e2f1fcc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GXHUT2517760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7c2e837112e697d4d3f022feec846a019f5cc76e6bc9e42cfa75d85b5aa16c. 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/GXHUT2554038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaaa9df68f8d62b9bed4082dc8c805ff6c0096de85c510e865b4a4404cb318c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GXHUT2554040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fad3c20477cb63ec4cf7a84bfd73b5d34920fa7bd61844e28a7f47d585521e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GXHUT2554039.