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 0x55fc361dab16077f1591c5e8878b04a4615cc24ad6b227fada4e176b589c76d4. 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/285cf2e0-84fc-45b2-ae2e-dabb4317bc1e.json and https://artists.proofprofile.net/proofs/artist/285cf2e0-84fc-45b2-ae2e-dabb4317bc1e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Build & Buy Mode 1 (From "The Sims 4") - Piano
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 0x67a5e50ece6332b58a04bb87b427424d5f3e84c096c562946f79720a3acca82c. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/AUGBT2465510.
CAS Identity Check (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cd92e58b71fe2434e7eaf495444383c7d674fc7e5088d0b7914649628a2289. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/AUGBT2465515.
Build & Buy Mode 7 (From "The Sims 4: Outdoor Retreat") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6364a193f8d8848e27ddd33847dab822123f0506bcbe0516023fd798f2fae60. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/AUGBT2465521.
Fortissimo Personality (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598e3706fa480ebca3a82e43db15e31d5c42b7388ce63561736f2087dd8a97fe. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/AUGBT2465523.
Build & Buy Mode 9 (From "The Sims 4: Get To Work“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d231d5343a40bfc1ee8882720c2b670eac7b56f7a81be7bd43fdbb45862d9c. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/AUGBT2465525.
Build & Buy Mode 2 (From "The Sims 4") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8f946d5829b91c8258ac9b32332ea235de3a8e82afee19b2db261a0b1c28b7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AUGBT2465526.
Buy Me the Sweet Life (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be1982946b0cf5781bd400f4691474caae9a6a886c0bb1b7ea76821358bbcd2. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/AUGBT2465528.
Build & Buy Mode 8 (From "The Sims 4: Get To Work“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4a26c4cd060d796a28f5f44316ceef2be1317d5f3690a69bbb5cbb41e1a062. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/AUGBT2465531.
Build & Buy Mode 12 (From "The Sims 4: Get Together“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbb5c39bc07ee0829939c54d1150a88b193a3d969da7d44133cdfecf33f8ad6. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/AUGBT2465532.
Simple Assembly (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e78ecabb9e94edfec1473e461b7bb694f8cca3591cfa9ac5ca42049e4558ca. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/AUGBT2465535.
Build & Buy Mode 5 (From "The Sims 4") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b3df02b5e77f046d4c73ec2aac599eea6006a3cf62745d729520d26be55dc1. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/AUGBT2465536.
Build & Buy Mode 4 (From "The Sims 4") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b6b045eb9689d136e7930d0775a11a00b073cd595bd33c96df8b1aa542d482. 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/AUGBT2465538.
Skylines in Sand (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf573b6c18dfe5ac20f94a09e35c14ac384a8627e5ef7efdcada68f1c505a2f. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/AUGBT2465539.
Build & Buy Mode 13 (From "The Sims 4: Dine Out“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bfa42c584053b6d0792faf2aea16cda35747cef7aa8100f12abd496242779e. 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/AUGBT2465542.
Build & Buy Mode 6 (From "The Sims 4") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8066cca4dacb67b82c13df6a5aaff6f57c6a92cc2630e81735c82c9b00acf008. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/AUGBT2465543.
Beyond The Clouds (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7600efd56bead75eb09f98626d07a14c0475d9d130abe161f923ad32e9dc100. 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/AUGBT2465544.
Build & Buy Mode 10 (From "The Sims 4: Spa Day“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9042fbcb8bb5d0ffb060d7b1fdd18a1629656c719fd96588b19fd2681fc0eb0. 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/AUGBT2465547.
Build & Buy Mode 16 (From "The Sims 4: Parenthood“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb538cefe65514ae88fce3306d84a4df5c3e75879d218de9b7c06fab40a5b2b93. 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/AUGBT2465548.
Cartographer's Symphony (From "The Sims 3“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00dbeb88b7bafa194290cab1ab3ea5924704135dfab6a5ea59f20bd7e800ab7. 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/AUGBT2465549.
Build & Buy Mode 15 (From "The Sims 4: Vampires“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa604d6c705c7d37acf1e31ec8453b56c8021ae1c229918ced515a192f6379ca. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/AUGBT2465550.
Build & Buy Mode 11 (From "The Sims 4: Get Together“) - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f4c52494787be149d885db204d5daa2620c74dc05a91402921209436738c44. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/AUGBT2465552.
Sale on Aisle Six (From "The Sims 3") - Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20d5fa9326fb701f23f3439511f198c59e9ac85f64cc6f27d5efd8078dc0bdf. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/AUGBT2465553.