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 0xe52b1b02d3e2ed86788d62150676582686cd73c57f23aee6596a114bf0f98f7b. 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/65e20305-1d43-4230-9019-24f80d2c2639.json and https://artists.proofprofile.net/proofs/artist/65e20305-1d43-4230-9019-24f80d2c2639.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 0x1165f08f267d21b8d8bfe14b2935e44d8bf52dcc5faaeb1fefc33bc026ac58ad. 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/QM6N21833743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9e934ea1addcc5fa57ff75aa888acae644f8b32ac1263a9211ba3e1737b1db. 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/QM6N21833745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6464540cc21a5808a642aa1e1da8be8f64da689864979c6fc3a14716cbf53cc3. 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/USLZJ1557221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7ddd5b15424acfb8c038cebad435e58149f517ccda4791767e31dd4a09a913. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USLZJ1557230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5565913883799923d4abde6678878467a52df1510d5c43485551a3b31e4838. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USLZJ1558810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8988237878b9b42e16f35f6e13fc8720fb8e0fb47b24e2f7d2a1ac5dde02f813. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/USLZJ1564074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dcde58c48ad36c1407a269675a7059002e4f22a7e075412ef10eb1e7821787. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USLZJ1564077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cc8d27313f148b61149f7f8ca8aa384e656d6034e277a10fdce9c944928fa3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USLZJ1564080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05396dffdbbd67f217f600b4ca83f2ceabd56981f48369064f6df9fd56f27f6. 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/USLZJ1572080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36391760ec772f5c9704e45538b9b53d0789e9fb1bd05cffae00f4707e5bed4. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USLZJ1572082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbb68605f08ecec1d8550ffb64c71239e6f9ca20624fa165f11e63da7f3a384. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/QZ7YY2090259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7a8c45a35485dfcc024f0940e20cd4bd6f3dd21fa51af6bf22a0da2dde2b62. 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/QZ7YY2090260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597b4205490749f7f7e8a790be229e475afa8cd21f0bc901fbe9e944a0bff5e8. 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/QZ7YY2090235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6c6ec122ef545a2b885e6493d118f23b9d984674d44d56616650520dca4cd5. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZ7YY2090236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb3a76ae53a2a63ac531cecd07f001a345554b4141070b61f19c659b682fa26. 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/QZ7YY2090238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69315df1a6531bde197aab101d5ecdd9a0ecd9ece2a2136b8ef68847088a7482. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZ7YY2090243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27cbd25ac74e1c640ff75006d6554c81df4266a857e6be86a7c45511fa8df1d. 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/QZNFJ2306259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4040ec27f70b2e82221e748d6ce2b5d628c768660649578d6d27867fd9c1a1b3. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZNFJ2306279.