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 0x8a2edfdbcfd572403daa69f544252fae0082c97c19dd1df4ce8f479fc02471ea. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dbb5fa9b-5563-445a-9252-a41966d3712f.json and https://artists.proofprofile.net/proofs/artist/dbb5fa9b-5563-445a-9252-a41966d3712f.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 0x37a83927fea5a9c1e730880df5388badac37cb395e89cb9a65a1805b179d0c25. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXCI42300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e757dc507ba9a2c90cde9cd07685b15d7830507c3150cb87f0c6e179fdbf2f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BXCI42300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d447a509dccc2816e0c5cd8a703e575f24c1a9632a88358a73bc751ea69eb53. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXCI42300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb42cb010d1a6f00de9300268746d0c849d27429d289ecdd31090edfc9ad97c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BXCI42300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa80a39a1aaff96610e0b7354c59d8678761c091354858291830d229a3257176. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BXCI42300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75d9217e283f2a6f906c582320dac70deb5510ee7ce0bd27c5a97bd89a455a4. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/BXCI41800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63008d16d1056b876b41ad29a4c8431ecc38010cb7ef39d3bd4cd35d22eb9daf. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/US7VG2450567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870b044f0d385d73dce6a006f54d458befe389a7af86d09b6ab8562f9c307042. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/US7VG2450568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef78246026e59565352618968b49c7dc4927b5b2c099a9aa8fae65ab1aedfe7. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US7VG2450569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a82deafec0cbec8f4869d20d21eb99c8af37c81163b9e8cd8df22d6b06b421e. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/US7VG2450570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30400075ae8c12997520d633d649e95e81bb26ca1098709d4ad9dcd19ce55ec. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US7VG2450571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211c5b1a3d80dac3bbd821465250ea6f7c779b4f9f10509520507106a53a0c8b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US7VG2450572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5fc3e7ac14ceb266165be08f03e42d9d5f659f5eb489da220635da2af9e32a. 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/US7VG2450573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5602e8e27bd710e885d0834134693a1da8bf965e3d294cc76b85b7f458f83de6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US7VG2450574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1967eef310fceb4df36dab5dd9909eb9a035f8e56df20d3fdd2ea5940e09b22b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BR1HK2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff7e5374c566ce6730cccd74e0813dd83f0ab33a55a6947b2d6eddfcfdd5051. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/BCOBK2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20b786ee009acb9d704ea0d8155ec675c48ce638d1884054bdeea3270643248. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BCOBK2100003.
Sonora: Ciclo Internacional de Compositoras, Vol. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ea2d8e3b2a22fa33db7f0ffc1e70d2f0c93f91f5fa14ac67287ed278248a8a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BC7FD2500004.